CN208508805U - Intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance - Google Patents
Intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance Download PDFInfo
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- CN208508805U CN208508805U CN201621382528.0U CN201621382528U CN208508805U CN 208508805 U CN208508805 U CN 208508805U CN 201621382528 U CN201621382528 U CN 201621382528U CN 208508805 U CN208508805 U CN 208508805U
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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
Abstract
The utility model discloses a kind of intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, it includes input rectifying unit, filter unit, PFC boost unit, and: LLC isolated converter unit includes first switch tube, second switch, the first freewheeling diode, the second freewheeling diode, transformer, resonant capacitance and discharge resistance；D/C voltage filter unit；Inversion reversed phase unit, including the inverter bridge being made of the 4th switching tube, the 5th switching tube, the 6th switching tube and the 7th switching tube and filter inductance, the output end of the inverter bridge is connected to the front end of filter inductance, the rear end of the filter inductance connects load, the filter inductance is used to filter out the high-frequency impulse in the alternating current, and provides power frequency sinusoidal ac for load.The utility model not only increases the PF value of voltage conversion device, additionally it is possible to filter out the high-frequency impulse of outlet side, and then provide high-quality power frequency sinusoidal ac for load.
Description
Technical field
The utility model relates to voltage conversion circuit more particularly to a kind of intelligent full-bridge based on PFC and LLC resonance are sinusoidal
Wave voltage conversion circuit.
Background technique
In the prior art, it is otherwise known as insert row by the intelligent boost-buck conversion equipment that AC turns AC, in the device, sine wave electricity
Voltage conversion circuit topology is its Key Circuit, is a kind of circuit for being able to achieve AC-AC transformation, can be realized in AC-AC transformation
The function of buck and burning voltage and frequency.However most of current AC-AC equipment Market is the topology electricity of non-isolation type
Road, and PF value is low, output voltage quality is low, security reliability is poor.In practical application, due to there is switch in voltage conversion process
Pipe switches at high speed, so that the outlet side of circuit can have certain high-frequency pulse signal, and then influences the quality of output voltage,
Thus it is difficult to meet conversion requirements.
Utility model content
The technical problem to be solved by the present invention is to, in view of the deficiencies of the prior art, provide it is a kind of based on PFC with
The intelligent full-bridge sine voltage conversion circuit of LLC resonance, to improve the PF value of voltage conversion device, improve output voltage
Quality, and the high-frequency impulse of outlet side can be filtered out, and then provide high-quality power frequency sinusoidal ac for load.
In order to solve the above technical problems, the utility model adopts the following technical solution.
A kind of intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance comprising have for power grid electricity
The filter unit of pressing the input rectifying unit, the voltage for exporting to input rectifying unit that are rectified to be filtered is used for
The PFC boost unit of boost conversion is carried out to the voltage of filter unit output, and: a LLC isolated converter unit includes
First switch tube, second switch, the first freewheeling diode, the second freewheeling diode, transformer, resonant capacitance and electric discharge electricity
Resistance, the drain electrode of the first switch tube are connected to the output end of PFC boost unit, and the source electrode of the first switch tube is connected to change
The first end of depressor, with connecting front end by resonant capacitance, the drain electrode of the second switch connects the second end of the transformer
Be connected to the source electrode of first switch tube, the source electrode of the second switch by discharge resistance with connecting front end, the first switch
The grid of pipe and the grid of second switch are used to load the pwm pulse signal of two-way opposite in phase, to enable the first switch
Pipe and second switch alternate conduction, the first end of the transformer secondary winding are connected to the anode of the first freewheeling diode,
The second end of the transformer secondary winding is connected to the anode of the second freewheeling diode, the cathode of first freewheeling diode
With being all connected with rear end with the cathode of the second freewheeling diode, the centre tap of the transformer secondary winding is isolated as LLC and is become
The output end of exchange unit；One DC voltage filter unit, includes the first electrolytic capacitor, the anode of first electrolytic capacitor
It is connected to the output end of LLC isolated converter unit, the cathode of first electrolytic capacitor is with connecting rear end；One inversion paraphase list
Member, is connected to the output end of LLC isolated converter unit, and the inversion reversed phase unit includes by the 4th switching tube, the 5th switch
Pipe, the inverter bridge of the 6th switching tube and the 7th switching tube composition and filter inductance, the grid of the 4th switching tube, the 5th open
Grid, the grid of the 6th switching tube and the grid of the 7th switching tube for closing pipe are respectively used to access pwm control signal, pass through control
4th switching tube, the 5th switching tube, the 6th switching tube and the 7th switching tube on or off, to enable the inversion reversed phase unit defeated
Alternating current out, the output end of the inverter bridge are connected to the front end of filter inductance, and the rear end of the filter inductance connects load, institute
It states filter inductance and provides power frequency sinusoidal ac for filtering out the high-frequency impulse in the alternating current, and for load.
Preferably, the input rectifying unit includes socket, insurance, lightning protection resistance, common mode inhibition inductance, safety capacitor
And rectifier bridge, the insurance are serially connected on the zero curve or firewire of socket, the front end of the common mode inhibition inductance is parallel to socket, institute
State the front end that lightning protection resistance is parallel to common mode inhibition inductance, the input terminal of the safety capacitor and rectifier bridge is parallel to common mode suppression
The output end of the rear end of inductance processed, the rectifier bridge is used for output ripple DC voltage.
Preferably, the filter unit includes filter capacitor, and the filter capacitor is connected to the defeated of input rectifying unit
Between outlet and front end ground.
Preferably, the PFC boost unit includes boost inductance, third switching tube, the first rectifier diode and second
Electrolytic capacitor, the front end of the boost inductance are connected to the output end of filter unit, and the rear end of the boost inductance is connected to
The drain electrode of three switching tubes, with connecing front end, the grid of the third switching tube is for accessing all the way for the source electrode of the third switching tube
Pwm control signal, the anode of drain electrode the first rectifier diode of connection of the third switching tube, first rectifier diode
Output end of the cathode as PFC boost unit, and the cathode of first rectifier diode connects the anode of the second electrolytic capacitor, the
The cathode of two electrolytic capacitors is with connecing front end.
Preferably, third pull down resistor is connected between the grid and front end ground of the third switching tube.
Preferably, further include having a MCU control unit, the grid of the first switch tube, the grid of second switch and
The grid of third switching tube is connected to MCU control unit, and the MCU control unit is for distinguishing output pwm signal to the
One switching tube, second switch and third switching tube, to control first switch tube, second switch and third switching tube on-off shape
State, the MCU control unit is also used to export four road pwm pulse signals to inversion reversed phase unit, to enable the inversion paraphase list
Member output alternating current.
It preferably, further include having an AC sampling unit, the AC sampling unit is connected to the defeated of input rectifying unit
Enter between end and MCU control unit, the AC sampling unit is used to acquire the voltage and feedback of input rectifying unit exchange side
To MCU control unit.
Preferably, it is connected with the first sampling resistor between the source electrode and front end ground of the third switching tube, the third is opened
The source electrode for closing pipe is connected to MCU control unit, and MCU control unit is enabled to acquire third switching tube by first sampling resistor
The electric signal of source electrode.
It preferably, further include having a D/C voltage sampling unit, the D/C voltage sampling unit includes be sequentially connected in series
The front end of two sampling resistors and third sampling resistor, second sampling resistor is connected to the output of LLC isolated converter unit
End, the rear end of the third sampling resistor is connected to MCU control unit, by second sampling resistor and third sampling resistor
And enable the electric signal of MCU control unit acquisition LLC isolated converter unit output end.
Preferably, the first pull down resistor, the second switch are connected between the grid and source electrode of the first switch tube
The second pull down resistor is connected between the grid and source electrode of pipe.
In intelligent full-bridge sine voltage conversion circuit disclosed by the utility model based on PFC and LLC resonance, input whole
After stream unit rectifies network voltage, the output ripple DC voltage using filtering unit filters utilizes PFC liter later
Pressure unit boosting processing is carried out to pulsating dc voltage, in LLC isolated converter unit, first switch tube, second switch,
Resonant capacitance, the leakage inductance of discharge resistance and transformer primary side and primary side magnetizing inductance form LLC resonance circuit, and in LLC resonance
Electric energy is transmitted to the secondary coil of transformer in the state conversion process of circuit, passes through the first freewheeling diode and the second afterflow
Diode rectification is at unidirectional ripple level, by changing the turn ratio of transformer primary vice-side winding, adjustable output voltage
Just, and then boosting or decompression conversion are realized.Based on above structure, the isolation that the utility model not only realizes voltage is passed
It is defeated, and then the PF value of step-up/down conversion equipment is improved, output voltage quality is also improved, so that voltage conversion process is more
Securely and reliably.On this basis, the utility model is provided with filter inductance in the output end of inversion reversed phase unit, utilizes filtered electrical
Sense can filter out the high-frequency impulse in alternating current, so that load can obtain good power frequency sinusoidal ac, and then improve output
Quality of voltage, to meet power demands.
Detailed description of the invention
Fig. 1 is the schematic diagram of the utility model full-bridge sine voltage conversion circuit.
Fig. 2 is the circuit diagram of AC sampling unit in the preferred embodiment in the utility model.
Fig. 3 is the circuit diagram of MCU control unit in the preferred embodiment in the utility model.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and examples.
The utility model discloses a kind of intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, in conjunction with
Shown in Fig. 1 to Fig. 3 comprising have the input rectifying unit 10 for being rectified to network voltage, be used for input rectifying list
The filter unit 20 that the voltage that member 10 exports is filtered, the voltage for exporting to filter unit 20 carry out boost conversion
PFC boost unit 30, and:
One LLC isolated converter unit 40 includes first switch tube Q6, second switch Q7, the first freewheeling diode
The drain electrode of D6, the second sustained diode 5, transformer T1, resonant capacitance C4 and discharge resistance R2B, the first switch tube Q6 connect
It is connected to the output end of PFC boost unit 30, the source electrode of the first switch tube Q6 is connected to the first end of transformer T1, described
By resonant capacitance C4 connection front end, the drain electrode of the second switch Q7 is connected to first and opens the second end of transformer T1
Close pipe Q6 source electrode, the source electrode of the second switch Q7 by discharge resistance R2B connection front end, the first switch tube Q6
Grid and the grid of second switch Q7 be used to load the pwm pulse signal of two-way opposite in phase, to enable the first switch
Pipe Q6 and second switch Q7 alternate conduction, the first end of the transformer T1 secondary winding are connected to the first sustained diode 6
Anode, the second end of the transformer T1 secondary winding is connected to the anode of the second sustained diode 5, first afterflow
The cathode of diode D6 and the cathode of the second sustained diode 5 with being all connected with rear end, in the transformer T1 secondary winding
Between output end of the tap as LLC isolated converter unit 40；
One D/C voltage filter unit 50 includes the anode connection of the first electrolytic capacitor C3, the first electrolytic capacitor C3
In the output end of LLC isolated converter unit 40, the cathode of the first electrolytic capacitor C3 is with connecting rear end；
One inversion reversed phase unit 70 is connected to the output end of LLC isolated converter unit 40, the inversion reversed phase unit 70
Including the inverter bridge and filter being made of the 4th switching tube Q1, the 5th switching tube Q2, the 6th switching tube Q3 and the 7th switching tube Q4
Wave inductance L3, grid, the grid of the 5th switching tube Q2, the grid and the 7th of the 6th switching tube Q3 of the 4th switching tube Q1 are opened
The grid for closing pipe Q4 is respectively used to access pwm control signal, is opened by the 4th switching tube Q1 of control, the 5th switching tube Q2, the 6th
Pipe Q3 and the 7th switching tube Q4 on or off are closed, to enable the inversion reversed phase unit 70 export alternating current, the inverter bridge
Output end is connected to the front end of filter inductance L3, and the rear end of the filter inductance L3 connects load, and the filter inductance L3 is used for
The high-frequency impulse in the alternating current is filtered out, and provides power frequency sinusoidal ac for load.
In above-mentioned full-bridge sine voltage conversion circuit, after input rectifying unit 10 rectifies network voltage, then pass through
It crosses filter unit 20 to filter and output ripple DC voltage, pulsating dc voltage is risen using PFC boost unit 30 later
Pressure processing, in LLC isolated converter unit 40, first switch tube Q6, second switch Q7, resonant capacitance C4, discharge resistance
The leakage inductance and primary side magnetizing inductance of R2B and transformer T1 primary side form LLC resonance circuit, and turn in the state of LLC resonance circuit
Electric energy is transmitted to the secondary coil of transformer T1 during changing, passes through the first sustained diode 6 and the second sustained diode 5
Be rectified into unidirectional ripple level, by change transformer T1 original vice-side winding turn ratio, the height of adjustable output voltage,
And then realize boosting or decompression conversion.Based on above structure, the utility model not only realizes the isolation transmission of voltage, in turn
The PF value for improving step-up/down conversion equipment, also improves output voltage quality, so that voltage conversion process more safely may be used
It leans on.On this basis, the utility model is provided with filter inductance L3 in the output end of inversion reversed phase unit 70, utilizes filter inductance
L3 can filter out the high-frequency impulse in alternating current, so that load can obtain good power frequency sinusoidal ac, and then improve output
Quality of voltage, to meet power demands.
About the processing of importation, the input rectifying unit 10 includes socket, insurance F2, lightning protection resistance RV1, is total to
Mould inhibits inductance L1, safety capacitor CX1 and rectifier bridge DB1, and the insurance F2 is serially connected on the zero curve or firewire of socket, described total
Mould inhibits the front end of inductance L1 to be parallel to socket, and the lightning protection resistance RV1 is parallel to the front end of common mode inhibition inductance L1, described
The input terminal of safety capacitor CX1 and rectifier bridge DB1 are parallel to the rear end of common mode inhibition inductance L1, and the rectifier bridge DB1's is defeated
Outlet is used for output ripple DC voltage.
In filtering part, the filter unit 20 includes filter capacitor C1, and it is whole that the filter capacitor C1 is connected to input
Between the output end and front end ground for flowing unit 10.
In the present embodiment, the PFC boost unit 30 includes boost inductance L2, third switching tube Q5, the first rectification two
The front end of pole pipe D1 and the second electrolytic capacitor C2, the boost inductance L2 are connected to the output end of filter unit 20, the boosting
The rear end of inductance L2 is connected to the drain electrode of third switching tube Q5, the source electrode of the third switching tube Q5 with connecing front end, the third
The grid of switching tube Q5 controls signal, two poles of the first rectification of drain electrode connection of the third switching tube Q5 for accessing PWM all the way
The anode of pipe D1, output end of the cathode of the first rectifier diode D1 as PFC boost unit 30, and first rectification two
The cathode of pole pipe D1 connects the anode of the second electrolytic capacitor C2, and the cathode of the second electrolytic capacitor C2 is with connecing front end.Further,
Third pull down resistor R22 is connected between the grid and front end ground of the third switching tube Q5.
In above-mentioned PFC boost unit 30, when monitoring that C1 exports half-wave alternating voltage, PFC enters boost mode, to mention
High AC turns the PF value that AC is intelligently depressured conversion topologies circuit, and passing through the filtered voltage of C2 after boosting is 400V.Specific boosting
Principle is as follows: when Q5 is connected, the boosted inductance L2 of electric current, Q5 to GND on C1 are formed into a loop, and boost inductance L2 stores energy；
When Q5 shutdown, the induced electromotive force more much higher than input voltage will form on boost inductance, induced electromotive force is through continued flow tube D1
Unidirectional pulse voltage is formed after being rectified and gives C2 capacitor again into filtering, is filtered into the DC voltage of 400V.Wherein Q5 is root
The input AC sine wave adopted according to MCU control unit 80 changes to increase or reduce the turn-on time of Q5, so that electric current and electricity
Pressure phase reaches unanimously to improve PF value.
About main control part, the present embodiment further includes having a MCU control unit 80, the grid of the first switch tube Q6,
The grid of second switch Q7 and the grid of third switching tube Q5 are connected to MCU control unit 80, the MCU control unit
80 for distinguishing output pwm signal to first switch tube Q6, second switch Q7 and third switching tube Q5, to control first switch
Pipe Q6, second switch Q7 and third switching tube Q5 on off operating mode, the MCU control unit 80 are also used to inversion reversed phase unit
70 four road pwm pulse signals of output, to enable the inversion reversed phase unit 70 export alternating current.Further, the MCU control
Unit 80 includes single-chip microcontroller U1 and its peripheral circuit.
Convenient for the electric signal of monitoring exchange side, the present embodiment further includes having an AC sampling unit 90, the exchange is adopted
Sample unit 90 is connected between the input terminal of input rectifying unit 10 and MCU control unit 80, and the AC sampling unit 90 is used
The voltage of side is exchanged in acquisition input rectifying unit 10 and feeds back to MCU control unit 80.
About the concrete composition of the AC sampling unit 90, the AC sampling unit 90 includes amplifier U9B, described
Two input terminals of amplifier U9B are connected to the input terminal of input rectifying unit 10, the amplifier by current-limiting resistance respectively
The output end of U9B is connected to MCU control unit 80.
For the ease of being acquired in real time to electric current, is connected between the source electrode and front end ground of the third switching tube Q5
One sampling resistor R2A, the source electrode of the third switching tube Q5 is connected to MCU control unit 80, by first sampling resistor
R2A and enable MCU control unit 80 acquire third switching tube Q5 source electrode electric signal.
As a preferred method, in order to be acquired to DC side electric signal, the present embodiment further includes having a D/C voltage
Sampling unit 60, the D/C voltage sampling unit 60 include the second sampling resistor R13 and third sampling resistor being sequentially connected in series
The front end of R15, the second sampling resistor R13 are connected to the output end of LLC isolated converter unit 40, the third sampling electricity
The rear end of resistance R15 is connected to MCU control unit 80, enables by the second sampling resistor R13 and third sampling resistor R15
The electric signal of acquisition 40 output end of LLC isolated converter unit of MCU control unit 80.
In order to improve the switching speed of first switch tube Q6 and the first pull down resistor R25, the grid of the first switch tube Q6
It is connected with the first pull down resistor R25 between pole and source electrode, is connected with second between the grid and source electrode of the second switch Q7
Pull down resistor R26.
Inversion reversed phase unit 70 in the present embodiment is made of Q1, Q2, Q3, Q4, L3, by the filtered DC voltage of C3
First high frequency arteries and veins level is formed through Q1, L4, load, Q4 forming circuit powering load；Second high-frequency impulse level passes through
Q2, L3, load, Q3 forming circuit, are filtered by inhibition of the L3 to high-frequency impulse level, are formed in load
One complete power frequency sine wave alternating voltage.The pwm signal of control chip U1 output is sent out respectively after driving circuit
The pole GATE of PWM1H, PWM1L, PWM2H, PWM2L to Q1, Q2, Q3, Q4.Phase and frequency in inversion phase inverter according to
The mode of control chip interior setting works, and Q1, Q2, Q3, Q4 are to modulate high-frequency PWM mode by power frequency to carry out work
Make, inductance L3 filters out high-frequency impulse level, leaves power frequency sinusoidal ac to load supplying.
Intelligent full-bridge sine voltage conversion circuit disclosed by the utility model based on PFC Yu LLC resonance, compared to existing
For having technology, firstly, the utility model has high PF value, realizes power grid and be isolated with output end, safety is very high, together
When, output voltage, and fixed output frequency can be automatically adjusted in input full voltage range, again, output voltage is
With sinewave output, automatic shaping function is pressed with to alternating current, in addition, the utility model contains voltage and current sample electricity
Road, can anti-surge voltage and electric current.
The above is the utility model preferred embodiment, is not intended to limit the utility model, all practical at this
Modification, equivalent replacement or the improvement etc. made in novel technical scope, should be included in the model that the utility model is protected
In enclosing.
Claims (10)
1. a kind of intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, which is characterized in that include to be used for
The filtering list that input rectifying unit, the voltage for exporting to input rectifying unit rectified to network voltage is filtered
Member, the voltage for exporting to filter unit carry out the PFC boost unit of boost conversion, and:
One LLC isolated converter unit includes first switch tube, second switch, the first freewheeling diode, the second afterflow two
Pole pipe, transformer, resonant capacitance and discharge resistance, the drain electrode of the first switch tube are connected to the output end of PFC boost unit,
The source electrode of the first switch tube is connected to the first end of transformer, before the second end of the transformer is connected by resonant capacitance
End ground, the drain electrode of the second switch are connected to the source electrode of first switch tube, and the source electrode of the second switch passes through electric discharge
With connecting front end, the grid of the first switch tube and the grid of second switch are for loading two-way opposite in phase for resistance
Pwm pulse signal, to enable the first switch tube and second switch alternate conduction, the first end of the transformer secondary winding
It is connected to the anode of the first freewheeling diode, the second end of the transformer secondary winding is connected to the sun of the second freewheeling diode
The cathode of pole, the cathode of first freewheeling diode and the second freewheeling diode with being all connected with rear end, the transformer secondary
Output end of the centre tap of winding as LLC isolated converter unit；
One D/C voltage filter unit includes the first electrolytic capacitor, and the anode of first electrolytic capacitor is connected to LLC isolation and becomes
The output end of exchange unit, the cathode connection rear end of first electrolytic capacitor；
One inversion reversed phase unit is connected to the output end of LLC isolated converter unit, and the inversion reversed phase unit includes by the 4th
The inverter bridge and filter inductance of switching tube, the 5th switching tube, the 6th switching tube and the 7th switching tube composition, the 4th switch
The grid of pipe, the grid of the 5th switching tube, the grid of the 6th switching tube and the grid of the 7th switching tube are respectively used to access PWM control
Signal processed, by the 4th switching tube of control, the 5th switching tube, the 6th switching tube and the 7th switching tube on or off, to enable
Inversion reversed phase unit output alternating current is stated, the output end of the inverter bridge is connected to the front end of filter inductance, the filter inductance
Rear end connect load, the filter inductance is used to filter out high-frequency impulse in the alternating current, and is providing power frequency just to load
String alternating current.
2. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as described in claim 1
In the input rectifying unit includes socket, insurance, lightning protection resistance, common mode inhibition inductance, safety capacitor and rectifier bridge, institute
It states insurance to be serially connected on the zero curve or firewire of socket, the front end of the common mode inhibition inductance is parallel to socket, the lightning protection resistance
The front end of common mode inhibition inductance is parallel to, after the input terminal of the safety capacitor and rectifier bridge is parallel to common mode inhibition inductance
The output end at end, the rectifier bridge is used for output ripple DC voltage.
3. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as described in claim 1
In the filter unit includes filter capacitor, and the filter capacitor is with being connected to output end and the front end of input rectifying unit
Between.
4. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as described in claim 1
In, the PFC boost unit include boost inductance, third switching tube, the first rectifier diode and the second electrolytic capacitor, it is described
The front end of boost inductance is connected to the output end of filter unit, and the rear end of the boost inductance is connected to the leakage of third switching tube
Pole, with connecing front end, the grid of the third switching tube is used to access pwm control signal all the way the source electrode of the third switching tube,
The anode of drain electrode the first rectifier diode of connection of the third switching tube, the cathode of first rectifier diode is as PFC
The output end of boosting unit, and the cathode of first rectifier diode connects the anode of the second electrolytic capacitor, the second electrolytic capacitor
Cathode with connecing front end.
5. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as claimed in claim 4
In being connected with third pull down resistor between the grid and front end ground of the third switching tube.
6. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as claimed in claim 4
In, it further include having a MCU control unit, the grid of the first switch tube, the grid of second switch and third switching tube
Grid is connected to MCU control unit, and the MCU control unit is for distinguishing output pwm signal to first switch tube, second
Switching tube and third switching tube, to control first switch tube, second switch and third switching tube on off operating mode, the MCU control
Unit processed is also used to export four road pwm pulse signals to inversion reversed phase unit, to enable the inversion reversed phase unit output alternating current.
7. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as claimed in claim 6
In, further include having an AC sampling unit, the AC sampling unit be connected to input rectifying unit input terminal and MCU control
Between unit, the AC sampling unit is used to acquire the voltage of input rectifying unit exchange side and feeds back to MCU control unit.
8. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as claimed in claim 6
In being connected with the first sampling resistor between the source electrode and front end ground of the third switching tube, the source electrode of the third switching tube connects
It is connected to MCU control unit, the telecommunications of MCU control unit acquisition third switching tube source electrode is enabled by first sampling resistor
Number.
9. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as claimed in claim 6
In, further include having a D/C voltage sampling unit, the D/C voltage sampling unit include the second sampling resistor for being sequentially connected in series and
The front end of third sampling resistor, second sampling resistor is connected to the output end of LLC isolated converter unit, and the third is adopted
The rear end of sample resistance is connected to MCU control unit, enables MCU control single by second sampling resistor and third sampling resistor
The electric signal of member acquisition LLC isolated converter unit output end.
10. the intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance, feature exist as described in claim 1
In being connected with the first pull down resistor, the grid of the second switch and source between the grid and source electrode of the first switch tube
The second pull down resistor is connected between pole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621382528.0U CN208508805U (en) | 2016-12-15 | 2016-12-15 | Intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621382528.0U CN208508805U (en) | 2016-12-15 | 2016-12-15 | Intelligent full-bridge sine voltage conversion circuit based on PFC Yu LLC resonance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614273A (en) * | 2020-06-23 | 2020-09-01 | 山东泰开高压开关有限公司 | Device for suppressing high-frequency oscillation in common high-frequency bus converter and converter |
| CN113765360A (en) * | 2021-09-03 | 2021-12-07 | 株洲市众普森技术有限公司 | Method for improving interleaved PFC light load efficiency |
| TWI752891B (en) * | 2021-06-25 | 2022-01-11 | 台達電子工業股份有限公司 | Llc resonance converter, control unit, and method of controlling the same |
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2016
- 2016-12-15 CN CN201621382528.0U patent/CN208508805U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614273A (en) * | 2020-06-23 | 2020-09-01 | 山东泰开高压开关有限公司 | Device for suppressing high-frequency oscillation in common high-frequency bus converter and converter |
| TWI752891B (en) * | 2021-06-25 | 2022-01-11 | 台達電子工業股份有限公司 | Llc resonance converter, control unit, and method of controlling the same |
| CN113765360A (en) * | 2021-09-03 | 2021-12-07 | 株洲市众普森技术有限公司 | Method for improving interleaved PFC light load efficiency |
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