CN109347317A - A kind of no-voltage pfc converter - Google Patents

A kind of no-voltage pfc converter Download PDF

Info

Publication number
CN109347317A
CN109347317A CN201811316874.2A CN201811316874A CN109347317A CN 109347317 A CN109347317 A CN 109347317A CN 201811316874 A CN201811316874 A CN 201811316874A CN 109347317 A CN109347317 A CN 109347317A
Authority
CN
China
Prior art keywords
output
resistance
voltage
connect
detection unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201811316874.2A
Other languages
Chinese (zh)
Inventor
何垒
刘湘
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mornsun Guangzhou Science and Technology Ltd
Original Assignee
Mornsun Guangzhou Science and Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mornsun Guangzhou Science and Technology Ltd filed Critical Mornsun Guangzhou Science and Technology Ltd
Priority to CN201811316874.2A priority Critical patent/CN109347317A/en
Publication of CN109347317A publication Critical patent/CN109347317A/en
Priority to PCT/CN2019/112794 priority patent/WO2020093872A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention provides a kind of no-voltage pfc converter, including main power cell 101, output voltage detection unit 102, error amplifying unit 103, logic control element 104, driving unit 105, negative current detection unit 106, first output end SW1 of driving unit 105 is connect with the grid of the main switch in main power cell, control opening and turning off for the main switch, the second output terminal SW2 of driving unit 105 is connect with the grid of the synchronous rectifier in main power cell, controls opening and turning off for the synchronous rectifier；When negative current detection unit 106 detects the inductance negative current and reaches setting electric current threshold value, the synchronous rectifier is turned off.Under the conditions of the different instantaneous input voltages of exchange input, the conducting of main switch is the set time, realizes PFC function.The present invention still is able to realize that no-voltage is opened with PFC function, efficiency when being conducive to promote product high input voltage is more favorable to realize product high frequency and miniaturization under the conditions of high input voltage.

Description

A kind of no-voltage pfc converter
Technical field
The present invention relates to switch converters field, in particular to the prime PFC technologies of AC-DC.
Background technique
The fast development of power electronic technique, Switching Power Supply are applied more and more extensive.AC-DC converter is as power network It is a vital unit of most of electronic equipment power sources with the interface of power electronics equipment.Alternating current is to direct current Conversion realize that and in rectification bridge output end shunt capacitance, this mode will lead to grid side by diode rectifier bridge mostly Current waveform is in pulse form, includes a large amount of significantly harmonic waves.Pollution for limitation harmonic current to power grid, guarantees power grid quality, Some countries and international organizations have formulated a series of harmonic standard.
For reduction and harmonic carcellation, PFC (PFC) should be carried out, to improve the power factor of equipment.It is main at present The power factor correction technology of stream is broadly divided into passive alignment technique (hereinafter referred to as passive PFC) and active correction technology is (following Referred to as active PFC).Passive PFC technology is to filter out the humorous of part order with the network of the passive devices such as inductance, capacitor composition Wave.The advantages of passive PFC circuit is simple, at low cost, good reliability, but calibration result is poor, it is difficult to be obtained very high Power factor, and bulky, smaller use at present.Active PFC circuit is small in size, available very high power Factor and the distortion of low-down current harmonics, are incorporated in various Switching Power Supplies extensively at present.
Active BOOST_PFC technology is technology conventional and mature at present, with the active BOOST_ in critical conduction mode that works For PFC, control block diagram is as shown in Figure 1.Active BOOST_PFC circuit generally includes following several parts: commutated network 101, BOOST converter 102, zero passage detection network 103, current sample network 104, driving network 105, output voltage sampling network Network 106 and PFC control chip IC.
PFC control IC pin function is generally as follows:
ZCD: zero current detection pin
MULT: the input pin of chip interior multiplier
VCC: the energization pins of chip
GND: the reference ground pin of chip
COMP: the compensation pin of chip voltage ring
INV: the feedback pin of output voltage
GATE: the driving pin of chip
CS: current sample pin
The circuit arrangement passes through the reference voltage V of INV pinrefMake BOOST converter with output voltage sampling network 106 Output voltage stabilization in fixed voltage value.Inductive current is zero moment, and inductance starts with switch junction capacitance with initial inductance Electric current is zero beginning resonance, after a delay time, controls the GATE pin output high level of chip, switching tube conducting.Electricity Voltage is compared with the class sinusoidal signal of control chip interior multiplier output on stream 104 sampling resistor R2 of sampling network, is made Input current substantially with input voltage same-phase, to obtain higher power factor value.Inductive current waveform is in power frequency period Interior diagram is as shown in Figure 2.
There are of short duration resonant process with switching tube capacitor for inductance, advantageously reduce switching tube and open moment corresponding hourglass source electrode Voltage stress.But since the voltage amplitude of resonance is influenced by input voltage, as 2Vin≤Vo, (Vin is input voltage, Vo is defeated Voltage out), the drain-source voltage of switching tube can resonance to zero, at the time of suitable open switching tube, it can be achieved that switching tube No-voltage is open-minded；And as 2Vin > Vo, the drain-source voltage of switching tube can not resonance to zero, as shown in Figure 3.This will be so that open It closes pipe and opens the turn-on consumption that there is a part constantly.When input voltage is higher, the partition losses are significant when switching frequency is larger Increase, product efficiency reduces, this will also be unfavorable for the high frequency and miniaturization of product.
Summary of the invention
For the prior art, when input voltage is higher, to cannot achieve no-voltage open-minded for switching tube, and efficiency reduces, it is difficult to real The deficiency of existing product high frequency and miniaturization, the present invention provide a kind of no-voltage pfc converter, make it in high input voltage condition Under, it still is able to realize that no-voltage is open-minded, efficiency when promoting product high input voltage is more favorable to realize product high frequency and small Type.
The present invention includes main power cell 101, output voltage detection unit 102, error amplifying unit 103, logic control Unit 104, driving unit 105, negative current detection unit 106.Main power cell 101 includes bridge heap DB1, inductance L1, input electricity Hold Cin, main switch Q1, synchronous rectifier Q2 (Q1, Q2 include parasitic body diode D1, D2 and parasitic junction capacitance Cds1, Cds2), output capacitance Co.AC-input voltage is connect with the end AC of bridge heap DB1 respectively, the positive output end of bridge heap DB1 and input One end connection of one end, inductance L1 of capacitor Cin, the negative output terminal of bridge heap DB1 and the other end, the output GND of input capacitance Cin Connection, the other end of inductance L1 are connect with the source electrode of the drain electrode of main switch Q1, synchronous rectifier Q2, the source electrode of main switch Q1 It is connect with the first input end of output GND, negative current detection unit 106, the drain electrode of synchronous rectifier Q2 is with output capacitance Co's One end, output end vo connection, output negative terminal and negative current detection unit of the other end of output capacitance Co as main power cell 106 the second input terminal connection.The first input end of output voltage detection unit 102, the second input terminal respectively with output end vo, GND connection is exported, the output end of output voltage detection unit 102 is connect with the input terminal of error amplifying unit 103, error amplification The output end of unit 103 is connect with the first input end of logic control element 104, the output end of negative current detection unit 106 with Second input terminal of logic control element 104 connects, the first output end of logic control element 104, second output terminal respectively with The first input end of driving unit 105, the connection of the second input terminal, the first output end SW1 and main switch Q1 of driving unit 105 Grid connection, control main switch Q1 opening and turning off, the second output terminal SW2 and synchronous rectifier of driving unit 105 The grid of Q2 connects, and control synchronous rectifier Q2's opening and turning off.
Negative current detection unit 106 includes resistance R1, resistance R2, resistance R3, feeder ear VCC, comparator comp1.Resistance One end of R1 is connect with output GND, and the first input end as negative current detection unit 106, the other end and electricity of resistance R1 Hinder one end of R2, the other end connection of output capacitance Co, and the second input terminal as negative current detection unit 106, resistance R2 The other end connect with the inverting input terminal of one end of resistance R3, comparator comp1, the other end of resistance R3 and feeder ear VCC The non-inverting input terminal of connection, comparator comp1 is connect with output GND, and the output end of comparator comp1 detects single as negative current The output end of member 106.The resistance value of preferred resistance R1 is smaller, and the resistance value of far smaller than resistance R2, resistance R3.
As another scheme of negative current detection unit 106, including diode D3, resistance R1, resistance R2, resistance R3, Feeder ear VCC, comparator comp1.Preferred diode D3 is Schottky diode.The cathode of diode D3 and the one of resistance R1 End, output GND connection, and the first input end as negative current detection unit 106, the anode of diode D3 are another with resistance R1's The other end connection of one end, one end of resistance R2, output capacitance Co, and the second input terminal as negative current detection unit 106, The other end of resistance R2 is connect with the inverting input terminal of one end of resistance R3, comparator comp1, the other end of resistance R3 and power supply VCC connection is held, the non-inverting input terminal of comparator comp1 is connect with output GND, and the output end of comparator comp1 is negative current inspection Survey the output end of unit 106.
Output voltage detection unit 102 includes resistance R4, resistance R5.One end of resistance R4 is connect with output Vo, and conduct The other end of the first input end of output voltage detection unit 102, resistance R4 is connect with one end of resistance R5, and as output electricity The output end of detection unit 102 is pressed, the other end of resistance R5 is connect with output GND, and as output voltage detection unit 102 Second input terminal.
Error amplifying unit 103 includes error amplifier EA1, reference voltage Vref, compensating electric capacity C1.Error amplifier The inverting input terminal of EA1 is connect with one end of compensating electric capacity C1, and the input terminal as error amplifying unit 103, error amplification The non-inverting input terminal of device EA1 is connect with reference voltage Vref, the output end of error amplifier EA1 and the other end of compensating electric capacity C1 Connection, and the output end as error amplifying unit 103.
Logic control element 104 includes comparator comp2, sawtooth signal Vosc, trigger U1, Power MOSFET mould Block.First input end of the inverting input terminal of comparator comp2 as logic control element 104, comparator comp2's is same mutually defeated Enter end to connect with sawtooth signal Vosc, the output end of comparator comp2 is connect with the reset terminal R of trigger U1, trigger U1 Second input terminal of the set end S as logic control element 104, the first output end Q, second output terminal Qn points of trigger U1 It is not connect with the first input end of Power MOSFET module, the second input terminal, the first output end of Power MOSFET module, Second output terminal is respectively as the first output end of logic control element 104, second output terminal.
The present invention detects inductance L1 negative current (with inductive current direction shown in Fig. 4 by negative current detection unit 106 On the contrary), when negative current reaches given threshold, synchronous rectifier Q2 is turned off, inductance L1 starts humorous with junction capacity Cds1, Cds2 Vibration, since inductance L1 is there are initial negative sense current value, the voltage amplitude of resonance is big, under the conditions of high input voltage, i.e. 2Vin > Vo When, resonance still is able to zero, to realize that no-voltage is open-minded.
Compared with prior art, the invention has the advantages that
1, it is open-minded that no-voltage is still able to achieve under the conditions of high-line input voltage；
2, the loss of switching tube opening process is reduced, product efficiency is promoted, is conducive to product miniaturization and high frequency.
Detailed description of the invention
Fig. 1 is the active BOOST_PFC control block diagram of the prior art；
Fig. 2 is prior art inductive current waveform diagram in power frequency period；
Fig. 3 is the Primary Component waveform in switch periods under the conditions of prior art high input voltage；
Fig. 4 is circuit block diagram of the present invention；
Fig. 5 is one circuit diagram of the embodiment of the present invention；
Fig. 6 is the Primary Component waveform in switch periods under the conditions of one high input voltage of the embodiment of the present invention；
Fig. 7 is the inductive current waveform diagram in power frequency period of the embodiment of the present invention one；
Fig. 8 is two circuit diagram of the embodiment of the present invention.
Specific embodiment
Embodiment one
As shown in figure 5, being the circuit block diagram of the embodiment of the present invention one.
No-voltage pfc converter of the invention includes main power cell 101, output voltage detection unit 102, error amplification Unit 103, logic control element 104, driving unit 105, negative current detection unit 106.
Main power cell 101 includes bridge heap DB1, inductance L1, input capacitance Cin, main switch Q1, synchronous rectifier Q2 (Q1, Q2 include parasitic body diode D1, D2 and parasitic junction capacitance Cds1, Cds2), output capacitance Co.
Negative current detection unit 106 includes resistance R1, resistance R2, resistance R3, feeder ear VCC, comparator comp1.
Output voltage detection unit 102 includes resistance R4, resistance R5.
Error amplifying unit 103 includes error amplifier EA1, reference voltage Vref, compensating electric capacity C1.
Logic control element 104 includes comparator comp2, sawtooth signal Vosc, trigger U1, Power MOSFET mould Block.
AC-input voltage is connected with the end AC of bridge heap DB1 respectively, and the positive output end of bridge heap DB1 is with input capacitance Cin's The negative output terminal of one end connection of one end, inductance L1, bridge heap DB1 is connect with the other end of input capacitance Cin, output GND, inductance The other end of L1 is connect with the source electrode of the drain electrode of main switch Q1, synchronous rectifier Q2, the source electrode of main switch Q1 and output One end connection of GND, resistance R1, the drain electrode of synchronous rectifier Q2 are connect with one end of output capacitance Co, output end vo, output electricity The other end for holding Co is connect with one end of the other end of resistance R1, resistance R2, the other end of resistance R2 and one end, the ratio of resistance R3 Inverting input terminal connection compared with device comp1, the other end of resistance R3 are connect with feeder ear VCC, the homophase input of comparator comp1 End is connect with output GND, and the output end of comparator comp1 is connect with the set end S of trigger U1.
One end of resistance R4 is connect with output end vo, one end of the other end of resistance R4 and resistance R5, capacitor C1 one end, The inverting input terminal of error amplifier EA1 connects, and the other end of resistance R5 is connect with output GND, the same phase of error amplifier EA1 Input terminal is connect with reference voltage Vref, the other end of the output end of error amplifier EA1 and capacitor C1, comparator comp2 Inverting input terminal connection, the non-inverting input terminal of comparator comp2 are connect with sawtooth signal Vosc, the output of comparator comp2 End is connect with the reset terminal R of trigger U1.
Output end Q, Qn of trigger U1 is connect with Power MOSFET module input respectively, and wherein Q and Qn is " non-" Logical relation.Q, Qn signal are arranged to the complementary signal with certain dead time by Power MOSFET module.When dead zone Between control module output end and driving unit input terminal connect, output end SW1, SW2 of driving unit respectively with main switch The grid connection of pipe Q1, synchronous rectifier Q2, and control main switch Q1, synchronous rectifier Q2 opening and turns off.
Details are as follows for its working principle:
AC exchange inputs the half-wave voltage vin (t) after rectified bridge DB1 is rectified at class sine, and frequency is AC input electricity 2 times of voltage-frequency rate, the frequency of usual ac input voltage is far smaller than switching frequency, it can thus be assumed that corresponding in a switch periods Input voltage be fixed value Vin.
In one switch periods, the course of work can briefly be divided into 5 stages, as shown in Figure 6.
T0~t1:Q1 is opened, Q2 is turned off.Input voltage vin carries out excitation to inductance L1, and inductive current gradually increases, directly Terminate when being turned off to t1 moment Q1.Inductive current I in the stageLWith the drain-source voltage V of Q1DS1Meet
Inductive current:
Q1 drain-source voltage: VDS1(t)=0 (2)
Wherein LMFor the inductance inductance value of inductance L1.
T1~t2:Q1 shutdown, Q2 shutdown, the electric current of inductance L1 is to junction capacity Cds1Charging, to junction capacity Cds2Electric discharge, works as Q1 When selecting same model switching tube with Q2, junction capacity is equal in magnitude.Since t1 moment inductive current is larger, when capacitor charge and discharge Between it is very of short duration, it is believed that inductive current remains unchanged, until t2 moment VDS1=Vo (Vo is output voltage) and knot when Q2 is opened Beam.Inductive current I in the stageLWith the drain-source voltage V of Q1DS1Meet
Inductive current: IL(t)=IL(t1) (3)
Q1 drain-source voltage:
Wherein CJFor the capacitance size of junction capacity.
T2~t3:Q1 shutdown, Q2 are open-minded.Output voltage Vo and the voltage difference of input voltage vin remove inductance L1 Magnetic.Due to t2 moment Q1 drain-source voltage VDS1=Vo, then Q2 drain-source voltage VDS2=0, and t2 moment Q2 is open-minded, therefore Q2 is real It is open-minded no-voltage has been showed.The stage is until t3 moment inductive current terminates when being zero.Inductive current I in the stageLWith the leakage of Q1 Source voltage VDS1Meet
Inductive current:
Q1 drain-source voltage: VDS1(t)=Vo (6)
T3~t4:Q1 shutdown, Q2 are open-minded.Output voltage Vo and the voltage difference of input voltage vin carry out inductance L1 anti- To excitation, inductive current becomes negative sense (contrary with inductive current shown in Fig. 5), until t4 moment inductive current reaches negative sense Threshold value IL(th), the Q2 shutdown moment terminates, inductive current I in the stageLWith the drain-source voltage V of Q1DS1Meet
Inductive current:
Q1 drain-source voltage: VDS1(t)=Vo (8)
T4~t0:Q1 shutdown, Q2 shutdown.Inductance L1 is with initial current IL(t4) with junction capacity Cds1、Cds2Resonance, until t0 Moment VDS1=0, Q1 are opened to be terminated constantly, and enters next period.Inductive current I in the stageLWith the drain-source voltage of Q1 VDS1Meet
Inductive current:
Q1 drain-source voltage: VDS1(t)=(Vo-Vin) cos [ω0(t-t4)]+IL(t4)Z0sin[ω0(t-t4)]+Vin (10)
Wherein
Due to t0 moment VDS1=0, Q1 are open-minded, therefore equally to realize no-voltage open-minded by Q1.Main switch Q1 with it is synchronous whole Flow tube Q2 realizes that no-voltage is open-minded, will greatly reduce the loss in switching tube opening process.
When output voltage stabilization, the output voltage Vea of error amplifier EA1 is a fixed value, Vea and signal VoscIt carries out Compare, works as VoscVoltage generates pulse signal when rising to equal with Vea, the triggered device U1 of the pulse signal, Power MOSFET Q1 shutdown, Q2 conducting are controlled after module and driving unit, and make VoscVoltage amplitude.
In t0~t1 stage, inductive current does not flow through resistance R1, but feeder ear VCC is returned by resistance R3, resistance R2, resistance R1 Road generates bias voltage in the inverting input terminal of comparator.To reduce loss, usual resistance R1 resistance value is smaller, and resistance value is much small In the resistance value of resistance R2, resistance R3.Comparator comp1 inverting input terminal voltage Vcs approximation meets at this time
Wherein VCCFor the voltage value of feeder ear VCC.
T2~t4 stage, inductive current through resistance R1, resistance R1 generate sampled voltage, sampled voltage and bias voltage into Row superposition, the inverting input terminal voltage Vcs of comparator comp1 meets at this time
T4 moment Vcs voltage is zero, and comparator comp1 generates pulse signal, when the triggered device U1 of the pulse signal, dead zone Between after control module and driving unit control Q1 open, Q2 shutdown, and make VoscVoltage is begun to ramp up.
When Vcs=0, corresponding inductive current is negative sense current threshold IL(th), negative current threshold value IL(th) meet
Under stable exchange input and loading condition, when output voltage Vo stablizes, the output electricity of error amplifier EA1 Pressure Vea is fixed voltage, and the turn-on time for controlling Q1 is the set time.According to voltage-second balance, different moments are corresponding instantaneous When input voltage changes, the turn-off time of Q1 by corresponding change, realizes adaptive frequency modulation(PFM) control.
When class sinusoidal variations are presented in input voltage, it can be seen that the peak envelope line of its inductive current is same according to formula (1) Class sinusoidal variations are presented in sample, when inductive current reaches negative current threshold value IL(th) inductive current rises when.Inductive current waveform Diagram is as shown with 7 in power frequency period.Inductive current will filter high-frequency current signal, opened after input capacitance Cin filtering Close the period in average current value, current waveform be class sine half-wave, also so that rectification before input current for The sinusoidal current of input voltage same-phase, to realize PFC function.
Embodiment two
As shown in figure 8, being the control block diagram of example two of the invention, the present embodiment is compared with embodiment one, difference Be: negative current detection unit 106 includes diode D3, resistance R1, resistance R2, resistance R3, feeder ear VCC, comparator comp1.Preferred diode D3 is Schottky diode.The cathode of diode D3 is connect with one end of resistance R1, output GND, And the first input end as negative current detection unit 106, the one of the other end of the anode of diode D3 and resistance R1, resistance R2 The other end connection at end, output capacitance Co, and the second input terminal as negative current detection unit 106, the other end of resistance R2 It is connect with the inverting input terminal of one end of resistance R3, comparator comp1, the other end of resistance R3 is connect with feeder ear VCC, is compared The non-inverting input terminal of device comp1 is connect with output GND, and the output end of comparator comp1 is negative the output of current detecting unit 106 End.
When inductive current negative sense, Schottky diode D3 cut-off does not influence the sampling of resistance R1, when inductance forward current When larger, since Schottky diode D3 forward voltage drop is usually 0.3~0.4V, resistance is limited by Schottky diode D3 The voltage of R1 reduces the loss of negative current detection unit 106.
It is disclosed above to be merely a preferred embodiment of the present invention, but the present invention is not limited to this, any this field Several modifications that technical staff carries out the present invention under the premise of without departing from core of the invention thought should fall in this hair Bright scope of protection of the claims etc.

Claims (10)

1. a kind of no-voltage pfc converter, including main power cell 101, main power cell include output end vo, output negative terminal, Export GND, inductance L1, main switch, synchronous rectifier, it is characterised in that: further include output voltage detection unit 102, error Amplifying unit 103, logic control element 104, driving unit 105, negative current detection unit 106；
The first input end of output voltage detection unit 102, the second input terminal respectively with the output end vo, the output The output end of GND connection, output voltage detection unit 102 is connect with the input terminal of error amplifying unit 103, error amplifying unit 103 output end is connect with the first input end of logic control element 104；The first input end of negative current detection unit 106 and Second input terminal is separately connected the output GND and the output negative terminal, the output end of negative current detection unit 106 with patrol The second input terminal connection of volume control unit 104, the first output end of logic control element 104, second output terminal respectively with drive The first input end of moving cell 105, the second input terminal connect, in the first output end SW1 and main power cell of driving unit 105 Main switch grid connection, control opening and turning off for the main switch, the second output terminal SW2 of driving unit 105 It is connect with the grid of the synchronous rectifier in main power cell, controls opening and turning off for the synchronous rectifier；
Negative current detection unit 106 detects the negative current of inductance L1 when reaching setting electric current threshold value, turn off it is described synchronize it is whole Flow tube；The turn-on time of the main switch is the set time under stable exchange input and loading condition.
2. a kind of no-voltage pfc converter according to claim 1, it is characterised in that: the main switch open with There are dead zone interval times between the opening of the synchronous rectifier；Inductance L1 and the main switch in main power cell Pipe, resonance of the synchronous rectifier within the interval time of dead zone, making main switch and synchronous rectifier realizes zero electricity It presses off logical.
3. a kind of no-voltage pfc converter according to claim 2, it is characterised in that: main power cell 101 further includes bridge Heap DB1, input capacitance Cin, output capacitance Co；AC-input voltage is connect with two ends AC of bridge heap DB1 respectively, bridge heap DB1 Positive output end connect with one end of one end of input capacitance Cin, inductance L1, the negative output terminal of bridge heap DB1 and input capacitance Cin The other end, output GND connection, the drain electrode of the other end and main switch of inductance L1, the source electrode connection of synchronous rectifier are led and are opened The source electrode for closing pipe is connect with the first input end of output GND, negative current detection unit 106, the drain electrode and output of synchronous rectifier One end of capacitor Co, output end vo connection, output negative terminal and negative current of the other end of output capacitance Co as main power cell Second input terminal of detection unit 106 connects.
4. a kind of no-voltage pfc converter according to claim 2, it is characterised in that: negative current detection unit 106 includes Resistance R1, resistance R2, resistance R3, feeder ear VCC, comparator comp1；One end of resistance R1 is connect with output GND, and as negative The first input end of current detecting unit 106, the other end and one end of resistance R2, the other end of output capacitance Co of resistance R1 connect It connects, and the second input terminal as negative current detection unit 106, the other end of resistance R2 and one end, the comparator of resistance R3 The inverting input terminal of comp1 connects, and the other end of resistance R3 is connect with feeder ear VCC, the non-inverting input terminal of comparator comp1 and Export GND connection, output end of the output end of comparator comp1 as negative current detection unit 106.
5. a kind of no-voltage pfc converter according to claim 4, it is characterised in that: the resistance value of the resistance R1 compared with It is small, and the resistance value of the resistance value of far smaller than resistance R2 and resistance R3.
6. a kind of no-voltage pfc converter according to claim 5, it is characterised in that: the negative current detection unit 106 further include diode D3, and the cathode of diode D3 is connected with one end of resistance R1, and the anode of diode D3 is another with resistance R1's One end is connected.
7. a kind of no-voltage pfc converter according to claim 6, it is characterised in that: the diode D3 is Xiao Te Based diode.
8. a kind of no-voltage pfc converter according to right 2, it is characterised in that: output voltage detection unit 102 includes electricity Hinder R4, resistance R5；One end of resistance R4 is connect with output Vo, and the first input end as output voltage detection unit 102, electricity The other end of resistance R4 is connect with one end of resistance R5, and the output end as output voltage detection unit 102, and resistance R5's is another End is connect with output GND, and the second input terminal as output voltage detection unit 102.
9. a kind of no-voltage pfc converter according to right 2, it is characterised in that: error amplifying unit 103 is put including error Big device EA1, reference voltage Vref, compensating electric capacity C1；The inverting input terminal of error amplifier EA1 and one end of compensating electric capacity C1 connect It connecing, and the input terminal as error amplifying unit 103, the non-inverting input terminal of error amplifier EA1 is connect with reference voltage Vref, The output end of error amplifier EA1 is connect with the other end of compensating electric capacity C1, and the output end as error amplifying unit 103.
10. a kind of no-voltage pfc converter according to right 2, it is characterised in that: logic control element 104 includes comparing Device comp2, sawtooth signal Vosc, trigger U1, Power MOSFET module；The inverting input terminal conduct of comparator comp2 The non-inverting input terminal of the first input end of logic control element 104, comparator comp2 is connect with sawtooth signal Vosc, is compared The output end of device comp2 is connect with the reset terminal R of trigger U1, and the set end S of trigger U1 is as logic control element 104 Second input terminal, the first output end Q, the second output terminal Qn of trigger U1 are inputted with the first of Power MOSFET module respectively End, the connection of the second input terminal, the first output end of Power MOSFET module, second output terminal are respectively as logic control element 104 the first output end, second output terminal.
CN201811316874.2A 2018-11-07 2018-11-07 A kind of no-voltage pfc converter Withdrawn CN109347317A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201811316874.2A CN109347317A (en) 2018-11-07 2018-11-07 A kind of no-voltage pfc converter
PCT/CN2019/112794 WO2020093872A1 (en) 2018-11-07 2019-10-23 Zero-voltage pfc converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811316874.2A CN109347317A (en) 2018-11-07 2018-11-07 A kind of no-voltage pfc converter

Publications (1)

Publication Number Publication Date
CN109347317A true CN109347317A (en) 2019-02-15

Family

ID=65314015

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811316874.2A Withdrawn CN109347317A (en) 2018-11-07 2018-11-07 A kind of no-voltage pfc converter

Country Status (2)

Country Link
CN (1) CN109347317A (en)
WO (1) WO2020093872A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020093872A1 (en) * 2018-11-07 2020-05-14 广州金升阳科技有限公司 Zero-voltage pfc converter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120169313A1 (en) * 2011-01-03 2012-07-05 Jae-Yong Lee Switch control circuit, converter using the same, and switch control method
CN102611296A (en) * 2012-03-13 2012-07-25 华为技术有限公司 Switch switching-off triggering circuit and power factor correction circuit
CN106033929A (en) * 2015-03-16 2016-10-19 台达电子工业股份有限公司 Power converter and control method for the same
CN106645893A (en) * 2016-09-30 2017-05-10 上海贝岭股份有限公司 Charge pump and voltage detection circuit thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014107989A (en) * 2012-11-28 2014-06-09 Toshiba Corp Dc-dc converter
US10277128B2 (en) * 2015-06-29 2019-04-30 Semiconductor Components Industries, Llc Switch control circuit and buck converter comprising the same
CN108390567B (en) * 2018-04-04 2020-07-17 广州金升阳科技有限公司 Zero-voltage switch Boost circuit and control method thereof
CN109347317A (en) * 2018-11-07 2019-02-15 广州金升阳科技有限公司 A kind of no-voltage pfc converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120169313A1 (en) * 2011-01-03 2012-07-05 Jae-Yong Lee Switch control circuit, converter using the same, and switch control method
CN102611296A (en) * 2012-03-13 2012-07-25 华为技术有限公司 Switch switching-off triggering circuit and power factor correction circuit
CN106033929A (en) * 2015-03-16 2016-10-19 台达电子工业股份有限公司 Power converter and control method for the same
CN106645893A (en) * 2016-09-30 2017-05-10 上海贝岭股份有限公司 Charge pump and voltage detection circuit thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
严阳: "单相软开关高效率半桥功率因数校正器研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020093872A1 (en) * 2018-11-07 2020-05-14 广州金升阳科技有限公司 Zero-voltage pfc converter

Also Published As

Publication number Publication date
WO2020093872A1 (en) 2020-05-14

Similar Documents

Publication Publication Date Title
TWI472139B (en) The control circuit of the flyback converter, the control method and the AC-DC power conversion circuit
CN203368317U (en) High PFC constant current control device without loop compensation and voltage converter
CN104734510B (en) Switch power supply and control chip thereof
CN102523650B (en) Light-emitting diode (LED) current detection and control circuit
CN102364848B (en) Primary side-controlled constant current switch power supply controller and primary side-controlled constant current switch power supply control method
CN101777770B (en) Control circuit for voltage dropping type power factor corrector
CN102364857B (en) Primary side constant current switching power controller and method
WO2019080400A1 (en) Sic power device-based full-bridge llc resonant plasma power supply
CN105553263B (en) Switching power supply with constant on-time control, and control circuit and control method thereof
CN102946196B (en) High power factor constant current driving circuit and constant-current device
CN107809830B (en) Buck-boost LED drive circuit
CN108880296A (en) power conversion system
CN111917300B (en) Secondary control isolation type DC/DC converter circuit topology structure
CN103401428B (en) Switch power supply control chip and switch power supply control system
CN202997938U (en) A high power factor constant current drive circuit and a high power factor constant current device
US20230208279A1 (en) Active diode circuit and ac/dc power conversion circuit
CN103281829B (en) A kind of LED drive circuit
CN103152955B (en) A kind of LED current detection and control circuit and method thereof
CN103414323A (en) Circuit for reducing turn-on time of current control type switch adjusting system
CN203466720U (en) Circuit reducing opening time in current control type switching regulating system
CN104124862B (en) High PFC constant-current control devices and voltage changer without loop compensation
Ismail et al. A high-quality rectifier based on Sheppard–Taylor converter operating in discontinuous capacitor voltage mode
CN109347317A (en) A kind of no-voltage pfc converter
CN103533710A (en) LED (light emitting diode) driver
CN103796389A (en) Largest brightness lifting module and silicon controlled light-dimmer LED driving circuit and system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20190215