CN207098946U - Mode of resonance switch converters - Google Patents
Mode of resonance switch converters Download PDFInfo
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- CN207098946U CN207098946U CN201720909507.8U CN201720909507U CN207098946U CN 207098946 U CN207098946 U CN 207098946U CN 201720909507 U CN201720909507 U CN 201720909507U CN 207098946 U CN207098946 U CN 207098946U
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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
This application discloses mode of resonance switch converters.The mode of resonance switch converters include：Main circuit, the multiple switch pipe being connected including the first transformer and with the first transformer primary side winding, DC voltage is transformed into square-wave signal by multiple switch pipe, main circuit is transmitted square-wave signal to vice-side winding from the first transformer primary side winding with resonance manner, so as to transmit electric energy, vice-side winding is connected to output end, so as to power to the load；And control circuit, it is connected with main circuit, for obtaining voltage sampling signal and current sampling signal from secondary, and the drive signal of multiple switch pipe is produced according to voltage sampling signal and current sampling signal, wherein, control circuit obtains voltage sampling signal and current sampling signal in a manner of non-isolated, and provides drive signal to multiple switch pipe with isolation method.The mode of resonance switch converters can remove optocoupler, so as to simplify circuit structure and improve the stability and reliability of work.
Description
Technical field
Power Electronic Technique is the utility model is related to, more particularly, to mode of resonance switch converters.
Background technology
Mode of resonance switch converters are to use switching tube to obtain square-wave voltage and use resonance circuit to carry out resonance with reality
The power inverter of existing energy transmission.LLC resonant converter includes three rank resonant networks of LLC compositions, can be in narrow frequency model
Enclose the interior regulation realized and loaded from being fully loaded with to zero load.LLC controlled resonant converters possess higher power density and less electronics member
Number of devices, while possess smooth current waveform, be advantageous to improve electromagnetic interference, and can be real in the range of whole service
The zero voltage switching (Zero Voltage Switching, ZVS) and zero current switching (Zero Current of existing switching tube
Switching, ZCS), help to obtain high efficiency, therefore be widely used.
Traditional LLC controlled resonant converter typically uses secondary side control methods (Secondary Side Regulation, SSR).
Secondary circuit sampled output current signal and output voltage signal, through error amplifier produce feedback signal, after pass through optocoupler will
Feedback signal is transmitted to transformer primary side from transformer secondary, and the feedback signal control that primary-side-control chip transmits according to optocoupler is opened
Pipe on or off is closed, realizes the closed loop regulation of output voltage or output current.
Fig. 1 shows a kind of SSR LLC half bridge resonant transformer schematic diagrames according to prior art.As illustrated, the resonance
Converter 100 includes circuit of power factor correction (PFC) 101, square wave generation circuit 102, resonance circuit 103, rectification circuit
104th, output capacitance Co and output current detection circuit Rsen.The controlled resonant converter 100 receives alternating voltage Vac, through pfc circuit
101 rectifications turn into a DC voltage, and the then inversion of classical prescription wave generation circuit 102 obtains a square-wave voltage.The square-wave voltage
Input resonant circuit 103, to produce resonance.By resonance circuit 103, energy from transformer T1 primary side are transferred to transformer T1
Secondary.After the rectified rectification of circuit 104 and output capacitance Co filtering, to load RL power supplies.Meanwhile sampling and error amplification
The sampled output current of circuit 107 and output voltage, thermal compensation signal COMP is produced through inside, and produced by optocoupler 106 in primary side
The feedback signal VFB corresponding with thermal compensation signal COMP.Primary-side-control circuit 105 is according to feedback signal VFB, controlling switch pipe Q1
With being switched on or off for Q2, and then realize constant voltage output control or Constant current output control.
However, the circuit structure of SSR LLC resonant converters is complicated, secondary includes sampling and error amplifying circuit 107, light
The grade component of coupling 106, so as to increase circuit cost, increasing circuit area, reduce circuit reliability.Optocoupler 106 can not work in
Hot environment, and low-frequency pole be present, so as to improve the design difficulty of SSR LLC resonant converters, cause job stability and
Less reliable.
Utility model content
In view of the above problems, the purpose of this utility model is to provide a kind of new mode of resonance switch converters, wherein
Control circuit directly obtains sampled signal from the secondary of transformer and is used for primary-side-control, so as to simplify circuit and change
Kind resonant operational stability and reliability.
According to first aspect of the present utility model, there is provided a kind of mode of resonance switch converters, including：Main circuit, including the
One transformer and the multiple switch pipe being connected with the first transformer primary side winding, the multiple switching tube turn DC voltage
Become square-wave signal, the main circuit is transmitted the square-wave signal to secondary from the first transformer primary side winding with resonance manner
Winding, so as to transmit electric energy, the vice-side winding is connected to output end, so as to power to the load；And control circuit, it is and described
Main circuit connects, for obtaining the voltage sampling signal for the output voltage for characterizing the main circuit from secondary and characterizing the main electricity
The current sampling signal of the output current on road, and according to producing the voltage sampling signal and the current sampling signal
The drive signal of multiple switch pipe, wherein, the control circuit obtains the voltage sampling signal and described in a manner of non-isolated
Current sampling signal, and provide the drive signal to the multiple switching tube with isolation method.
Preferably, the main circuit includes current sampling resistor with the connected in series with the load, the control circuit with
The output end is directly connected to obtain the voltage sampling signal, and is directly connected to the current sampling resistor to obtain
The current sampling signal.
Preferably, the control circuit includes：First error amplifier, for the current sampling signal and first to be joined
Examine voltage to compare, to obtain current error signal；Second error amplifier, for the voltage sampling signal and second to be joined
Examine voltage to compare, to obtain voltage error signal；Selecting module, put with first error amplifier and second error
Big device is connected, for selecting one of the current error signal and the voltage error signal to be used as thermal compensation signal；Control mould
Block, it is connected with the selecting module, for producing switch controlling signal according to the thermal compensation signal；And drive module, with
The control module is connected, for receiving the switch controlling signal and producing the drive signal of the multiple switching tube.
Preferably, the selecting module includes：First diode, its negative electrode are connected to the defeated of first error amplifier
Go out end；And second diode, its negative electrode are connected to the output end of second error amplifier, wherein, the one or two pole
The anode of pipe and second diode is connected to each other to provide the thermal compensation signal.
Preferably, the main circuit includes：Circuit of power factor correction, for alternating voltage is carried out rectification and power because
Number correction, to produce the DC voltage；Square-wave signal generation circuit, including the multiple switching tube, with the power factor
Correcting circuit is connected, for DC voltage to be transformed into square-wave signal；Resonance circuit, with the square-wave signal generation circuit phase
Connection, for receiving the square-wave signal with resonance manner and passing the square-wave signal from the primary side winding of the first transformer
Vice-side winding is transported to, so as to transmit electric energy；Rectification circuit, it is connected with the vice-side winding of the first transformer, for by the side of reception
Output voltage of the ripple signal rectification into direct current；And output capacitance, for being filtered to the output voltage.
Preferably, the multiple switching tube composition half-bridge circuit or full-bridge circuit in the square-wave signal generation circuit.
Preferably, the control circuit is used to produce the first drive signal and the second drive signal.
Preferably, in addition to：Isolation circuit, the isolation circuit are connected with the control circuit, to receive described
One drive signal and second drive signal, and be connected with the main circuit, to provide the drive of the multiple switching tube
Dynamic signal.
Preferably, the multiple switching tube includes the first switch pipe and second switch pipe of composition half-bridge, the isolation electricity
Road includes the second transformer, and second transformer has first to the tertiary winding, wherein, the first switch pipe and described the
Two switching tubes are sequentially connected in series between the feeder ear and ground of the DC voltage, and the Same Name of Ends of first winding receives institute
The first drive signal is stated, different name end receives second drive signal, and the Same Name of Ends of second winding is connected to described first
The control terminal of switching tube, different name end are connected to the intermediate node of the first switch pipe and the second switch pipe, and the described 3rd
The different name end of winding is connected to the control terminal of the second switch pipe, Same Name of Ends ground connection.
Preferably, the multiple switching tube includes the switching tubes of first switch Guan Zhi tetra- of composition full-bridge, the isolation electricity
Road includes the 3rd transformer, and the 3rd transformer has the first to the 5th winding, wherein, the first switch pipe and described
Two switching tubes are sequentially connected in series between the feeder ear and ground of the DC voltage, and the 3rd switching tube and the described 4th is opened
Close pipe to be sequentially connected in series between the feeder ear and ground of the DC voltage, the Same Name of Ends of first winding receives described the
One drive signal, different name end receive second drive signal, and the Same Name of Ends of second winding is connected to the first switch
The control terminal of pipe, different name end are connected to the intermediate node of the first switch pipe and the second switch pipe, the tertiary winding
Different name end be connected to the control terminal of the second switch pipe, Same Name of Ends ground connection, the different name end of the 4th winding is connected to institute
The control terminal of the 3rd switching tube is stated, Same Name of Ends is connected to the intermediate node of the 3rd switching tube and the 4th switching tube, institute
The Same Name of Ends for stating the 5th winding is connected to the control terminal of the 4th switching tube, different name end ground connection.
Preferably, in addition to：Start power supply circuit, for producing power supply electricity according to the alternating voltage when system starts
Pressure, for being powered to the control circuit.
Preferably, the startup power supply circuit includes：First electric capacity and the second electric capacity, first electric capacity and described second
The first end of electric capacity is used to receive alternating voltage；First commutation diode, the negative electrode of first commutation diode are connected to institute
The second end of the first electric capacity is stated, the anode of first commutation diode is connected to the second end and the ground connection of second electric capacity；
And second commutation diode, the anode of second commutation diode are connected to the second end of first electric capacity, described
The negative electrodes of two rectifying tubes provides the supply voltage, wherein, when the alternating voltage changes, first electric capacity and described the
Voltage generating period changes so as to produce electric current, first commutation diode and described second between the first end of two electric capacity
The current rectification is powered by commutation diode into DC current.
Preferably, the startup power supply circuit includes：First electric capacity and the second electric capacity, the first end of first electric capacity are used
In receiving alternating voltage, the first end of second electric capacity is grounded；First commutation diode, the moon of first commutation diode
Pole is connected to the second end of first electric capacity, and the anode of first commutation diode is connected to the second of second electric capacity
End and ground connection；And second commutation diode, the anode of second commutation diode are connected to the second of first electric capacity
End, the negative electrode of second rectifying tube provide the supply voltage, wherein, when the alternating voltage changes, first electricity
Hold and change voltage generating period between the first end of second electric capacity so as to produce electric current, first commutation diode
The current rectification is powered into DC current with second commutation diode.
Preferably, the main circuit can be operated in continuous current mode, discontinuous conduct mode or electric current critical conduction mode.
According to second aspect of the present utility model, there is provided a kind of control method of mode of resonance switch converters, including：Using
DC input voitage is transformed into square-wave signal by multiple switch pipe；With resonance manner by the square-wave signal from the first transformer
Primary side winding is transmitted to vice-side winding, so as to transmit electric energy so that the vice-side winding is connected to output end, so as to be supplied to load
Electricity, wherein, methods described includes obtaining voltage sampling signal and current sampling signal in a manner of non-isolated, and with isolation method
The drive signal is provided to the multiple switching tube, wherein the voltage sampling signal is used to characterize what is provided to the load
Output current, the voltage sampling signal are used to characterize the output voltage provided to the load.
Preferably, the output end is connected directly to obtain the voltage sampling signal, and is connected directly to and institute
The current sampling resistor of connected in series with the load is stated to obtain the current sampling signal.
Preferably, the step of drive signal for producing the multiple switching tube, includes：By the current sampling signal and
One reference voltage compares, to obtain current error signal；The voltage sampling signal is compared with the second reference voltage, with
Obtain voltage error signal；One of the current error signal and the voltage error signal is selected to be used as thermal compensation signal；According to
The thermal compensation signal produces switch controlling signal；And receive the switch controlling signal and produce the multiple switching tube
Drive signal.
Preferably, the drive signal of the multiple switching tube includes：First drive signal and the second drive signal.
Preferably, the multiple switching tube includes the first switch pipe and second switch pipe of composition half-bridge, the controlling party
Method also includes：Using the second transformer, the first drive signal and the second drive signal are supplied to described first with isolation method
Switching tube and the second switch pipe.
Preferably, second transformer has first to the tertiary winding, wherein, the first switch pipe and described second
Switching tube is sequentially connected in series between the feeder ear and ground of the DC input voitage, and the Same Name of Ends of first winding receives
First drive signal, different name end receive second drive signal, and the Same Name of Ends of second winding is connected to described the
The control terminal of one switching tube, different name end are connected to the intermediate node of the first switch pipe and the second switch pipe, and described
Three-winding different name end is connected to the control terminal of the second switch pipe, Same Name of Ends ground connection.
Preferably, the multiple switching tube includes first to fourth switching tube of composition full-bridge, and the control method is also wrapped
Include：Using the 3rd transformer, the first drive signal and the second drive signal are supplied to described first to fourth with isolation method
Switching tube.
Preferably, the 3rd transformer has the first to the 5th winding, wherein, the first switch pipe and described second
Switching tube is sequentially connected in series between the feeder ear and ground of the DC input voitage, the 3rd switching tube and the described 4th
Switching tube is sequentially connected in series between the feeder ear and ground of the DC input voitage, and the Same Name of Ends of first winding receives
First drive signal, different name end receive second drive signal, and the Same Name of Ends of second winding is connected to described the
The control terminal of one switching tube, different name end are connected to the intermediate node of the first switch pipe and the second switch pipe, and described
Three-winding different name end is connected to the control terminal of the second switch pipe, Same Name of Ends ground connection, and the different name end of the 4th winding connects
The control terminal of the 3rd switching tube is connected to, Same Name of Ends is connected to the middle node of the 3rd switching tube and the 4th switching tube
Point, the Same Name of Ends of the 5th winding are connected to the control terminal of the 4th switching tube, different name end ground connection.
Preferably, in addition to：Supply voltage is produced according to alternating voltage when system starts, for the multiple switch
Control circuit power supply.
According to the mode of resonance switch converters of the embodiment, control circuit obtains the voltage sample letter in a manner of non-isolated
Number and the current sampling signal, and produced according to the comparative result of the two and corresponding reference voltage for driving opening for primary side
The drive signal of pipe is closed, then provides the drive signal to the multiple switching tube with isolation method.
In a preferred embodiment, the feedback control loop of the control circuit includes the selecting module of diode and composition, is used for
The sample number of output current and output voltage is optionally sent to control module so that mode of resonance switch converters can carry
For stable output current and/or output voltage.
In a further preferred embodiment, mode of resonance switch converters also include starting power supply circuit.Described start supplies
Circuit is responsible for powering to the control circuit when the mode of resonance switch converters start.
In a further preferred embodiment, the power supply circuit includes the first electric capacity and the second electric capacity, first electricity
Hold and the second capacitance connection is between the primary and secondary side of controlled resonant converter, flowed through when being changed using electric capacity both end voltage in electric capacity
The principle of electric current, primary side electric energy is transmitted to secondary, to provide supply voltage.
In a further preferred embodiment, the rectification circuit includes the first diode and the second diode, and described
One diode and the second diode into a DC current, power the current rectification for flowing through electric capacity to the control circuit.
The control circuit directly obtains current sampling signal and voltage sampling signal from the secondary of controlled resonant converter, and then obtains
Drive signal is obtained, and drive signal is supplied to the primary side switch pipe of controlled resonant converter using isolation circuit, so as to save
The amplifying circuit and optocoupler of sampled signal, so as to simplify circuit structure, and the stabilization of work can be improved due to removing optocoupler
Property and reliability.
Brief description of the drawings
By the description to the utility model embodiment referring to the drawings, of the present utility model above-mentioned and other mesh
, feature and advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the simplified pinciple figure according to the LLC resonant converter of prior art；
Fig. 2 shows the illustrative circuitry of control circuit in the LLC resonant converter according to the utility model first embodiment
Figure；
Fig. 3 shows the schematic circuit of the LLC resonant converter according to the utility model second embodiment；
Fig. 4 shows the schematic circuit of the LLC resonant converter according to the utility model 3rd embodiment；
Fig. 5 shows the schematic circuit of the LLC resonant converter according to the utility model fourth embodiment.
Embodiment
Various embodiments of the present utility model are more fully described hereinafter with reference to accompanying drawing.In various figures, identical
Element is represented using same or similar reference.For the sake of clarity, the various pieces in accompanying drawing are not drawn to paint
System.
In this application, switching tube is operating switch mode to provide the transistor of current path, including selected from bipolar crystalline substance
One kind of body pipe or field-effect transistor.The first end of switching tube and the second end are hot end on current path respectively and low
Potential end, control terminal are used to receive drive signal with the turn-on and turn-off of controlling switch pipe.
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 2 shows the illustrative circuitry of control circuit in the LLC resonant converter according to the utility model first embodiment
Figure.The control circuit 210 is used for according to the voltage sampling signal and current sampling signal control directly obtained from the secondary of transformer
The conducting of the switching tube of the primary side of transformer processed and off-state, passed so as to control from the primary side winding of transformer to vice-side winding
The energy sent, to safeguard the constant of output voltage and/or output current.
In this embodiment, control circuit 210 includes error amplification module 211, control module 212 and drive module
213.The first input end of the control circuit 210 and the second input receive current sampling signal CS and voltage sampling signal respectively
VS, the first output end and the second output end provide the first drive signal VG1 and the second drive signal VG2 respectively.Control circuit 210
There can be single reference ground.
Error amplification module 211 includes the first error amplifier 214, the second error amplifier 215, the first reference voltage
Vref1, the first reference voltage Vref 2 and diode D1 and D2.Described in the positive input terminal connection of first error amplifier 214
First reference voltage Vref 1, the negative input end of the error amplifier 214 receive current sampling signal CS, current sample are believed
Number CS is compared with the first reference voltage Vref 1, to obtain current error signal.Second error amplifier 215 is just
Input connects second reference voltage Vref 2, and the negative input end of the error amplifier 215 receives the voltage sample letter
Number VS, by voltage sampling signal VS compared with the second reference voltage Vref 2, to obtain voltage error signal.Current sample
Signal CS is used for the numerical value for characterizing the output current of resonant converter main circuit, and voltage sampling signal VS is used to characterize resonant transformation
The numerical value of the output voltage of device main circuit.
Further, the output end of error amplifier 214 is connected with diode D1 negative electrode, error amplifier 215 it is defeated
Go out end with diode D2 negative electrode to be connected.The anode of the diode D1 is connected with the anode of the diode D2.Diode D1
Selecting module is formed with D2, for selecting one from current error signal and voltage error signal as thermal compensation signal COMP.
Control module 212 receives thermal compensation signal COMP caused by the error amplification module 211, and is believed according to the compensation
Number COMP produces switch controlling signal.
Drive module 213 receives the switch controlling signal, so as to produce first of the switching tube for driving primary side the drive
Dynamic signal VG1 and the second drive signal VG2.
According to the control circuit of the embodiment, control module obtains current sampling signal and electricity from the secondary of controlled resonant converter
Sampled signal is pressed, and the driving of the switching tube for driving primary side is produced according to the comparative result of the two and corresponding reference voltage
Signal.The feedback control loop of the control circuit includes the selecting module of diode D1 and D2 composition, for will optionally export electricity
The sample number of stream and output voltage is sent to control module.The control circuit can save the amplifying circuit and light of sampled signal
Coupling, so as to simplify circuit structure, and the stability and reliability of work can be improved due to removing optocoupler.
Fig. 3 shows the schematic circuit of the LLC resonant converter according to the utility model second embodiment.The LLC is humorous
The converter 200 that shakes includes main circuit 220, isolation circuit 230, starts power supply circuit 240 and control circuit 210 as shown in Figure 2.
In the controlled resonant converter, square-wave signal generation circuit 102 includes the switching tube Q1 and Q2 of composition half-bridge circuit.Main circuit 220
Continuous current mode, discontinuous conduct mode or electric current critical conduction mode can be operated in.
The main circuit 220 of LLC resonant converter 200 includes pfc circuit 101, square-wave signal generation circuit 102, resonance electricity
Road 103, rectification circuit 104, output capacitance Co, load RL and current sampling resistor Rsen.
Pfc circuit 101 receives alternating voltage Vac, after rectified and PFC, exports DC voltage.
In square-wave signal generation circuit 102, switching tube Q1 and Q2 are connected in series in two output ends of pfc circuit 101
Between.The output plus terminal of switching tube Q1 first end connection pfc circuit 101, switching tube Q1 the second end connecting valve pipe Q2's
First end, the output negative terminal of switching tube Q2 the second end connection pfc circuit 101, that is, be grounded.Switching tube Q1 and Q2 is from control circuit
210 obtain drive signal VG1 and VG2, so as to the on or off under the control of drive signal.In the course of the work, switching tube
Q1 and Q2 alternate conductions and shut-off, so as to which DC voltage is transformed into square-wave signal.Two output ends difference of the half-bridge circuit
For switching tube Q1 and Q2 intermediate node and ground, for providing the square-wave signal.
Resonance circuit 103 includes resonant inductance Lr, resonant capacitance Cr and transformer T1 primary side winding.Transformer T1 is included
Two windings, i.e. primary side winding and with tapped vice-side winding.Resonant inductance Lr first end connecting valve pipe Q1 and Q2
Intermediate node, resonant inductance Lr the second end connection transformer T1 primary side windings Same Name of Ends, transformer T1 primary side windings
Different name end connection resonant capacitance Cr first end, resonant capacitance Cr the second end ground connection.
Rectification circuit 104 includes the sustained diode c1 and Dc2 being connected with transformer T1 vice-side winding.Transformer T1
Vice-side winding Same Name of Ends connection sustained diode c1 anode, transformer T1 vice-side winding different names end connection fly-wheel diode
Dc2 anode, the centre tap of transformer T1 vice-side windings connect output ground.Sustained diode c1 negative electrode and fly-wheel diode
Dc2 negative electrode is connected, and is commonly connected to output capacitance Co anode.Output capacitance Co negative terminal connection output ground.
Load RL and current sampling resistor Rsen is connected in series between output capacitance Co anode and negative terminal.Although at this
Current sampling resistor Rsen in embodiment is resistance, it should be appreciated to those skilled in the art that in alternate embodiments,
The current measuring element of similar functions can be used to substitute current sampling resistor Rsen.
The control circuit 210 of LLC resonant converter 200 is connected with main circuit 220, for the secondary from main circuit 220
Obtain voltage sampling signal VS and current sampling signal CS, and the drive of the primary side switch pipe according to the two generation main circuit 220
Dynamic signal VG1 and VG2.
As shown in figure 3, the first input end of control circuit 210 is connected to current sampling resistor Rsen in main circuit 220
First end, receive current sampling signal CS.Second input of control circuit 210 is connected to output capacitance Co in main circuit 220
Anode, the first output end and the second output end of receiving voltage sampled signal VS control circuits 210 are connected to isolation circuit
230。
Isolation circuit 230 includes transformer T2.The driving transformer T2 includes three windings：N1、 N2、N3.N1 windings
Same Name of Ends be connected with the first output end of control circuit 210, the different name end of N1 windings and the second output end of control circuit 210
It is connected.The Same Name of Ends of N2 windings is connected with the control terminal of switching tube Q1 in main circuit 220, the different name end of N2 windings and main circuit
Switching tube Q1 the second end is connected in 220.The different name end of N3 windings is connected with the control terminal of switching tube Q2 in main circuit 220,
The Same Name of Ends of N3 windings is connected with the second end of switching tube Q2 in main circuit 220, that is, is grounded.Isolation circuit 230 is by control circuit
210 drive signal VG1 and VG2 isolation is transmitted to the input side of main circuit 220, is worked for driving switch pipe Q1 and Q2.
Starting power supply circuit 240 includes electric capacity Cs1, electric capacity Cs2, diode Ds1 and diode Ds2.Electric capacity Cs1 and electric capacity
Cs2 first end connects input ac voltage Vac both ends respectively, and electric capacity Cs1 the second end is connected to diode Ds1 the moon
Pole, electric capacity Cs2 the second end are connected to diode Ds1 anode, electric capacity Cs2 the second termination output ground.Diode Ds2's
Anode is even connected with diode Ds1 negative electrode, and diode Ds2 negative electrode is connected to the feeder ear VCC of control circuit 210.
In this embodiment, the power supply the principle for starting power supply circuit 240 is as follows：When electric capacity Cs1 first end and electric capacity Cs2
First end between voltage change when, will flow through electric current in electric capacity Cs1 and electric capacity Cs2, and pass through diode Ds1 and diode
Ds2 by the current rectification for flowing through electric capacity Cs1 and electric capacity Cs2 into after DC current, to the feeder ear VCC of control circuit 210
Power supply.Therefore, according to the power supply the principle for starting power supply circuit 240, arbitrary two potential points of primary side, as long as described two current potentials
Voltage between point is in cyclically-varying, you can described two potential points are connected respectively into the electric capacity Cs1 and electric capacity Cs2
First end, and then realize power supply.In the LLC resonant converter 200 according to the utility model second embodiment shown in Fig. 3, when
When input ac voltage Vac changes, the voltage change submission rheology between electric capacity Cs1 first end and electric capacity Cs2 first end
Change, flow through alternating current in electric capacity Cs1 and electric capacity Cs2, the alternating current is backward through diode Ds1 and diode Ds2 rectifications
The VCC power supplies of control circuit 210.
According to the LLC resonant converter of the embodiment, control circuit obtains current sample letter from the secondary of controlled resonant converter
Number and voltage sampling signal, and produce according to the comparative result of the two and corresponding reference voltage the switching tube for driving primary side
Drive signal.The feedback control loop of the control circuit includes the selecting module of diode D1 and D2 composition, for optionally will
Output current and the sampled signal of output voltage are sent to control module so that LLC resonant converter can provide the defeated of stabilization
Go out electric current and/or output voltage.The control circuit directly obtains drive signal according to the sampled signal of secondary, and using isolation electricity
Drive signal is supplied to the primary side switch pipe of controlled resonant converter by road, so as to save the amplifying circuit of sampled signal and light
Coupling, so as to simplify circuit structure, and the stability and reliability of work can be improved due to removing optocoupler.
Fig. 4 shows the schematic circuit of the LLC resonant converter according to the utility model 3rd embodiment.The LLC is humorous
The converter 300 that shakes includes main circuit 320, isolation circuit 230, starts power supply circuit 240 and control circuit 210 as shown in Figure 2.
Compared with the second embodiment shown in Fig. 3, it is according to the difference of the LLC resonant converter 300 of 3rd embodiment, main electricity
Current sampling resistor Rsen in road 320 is connected between the centre tap and ground of transformer T1 vice-side winding.
The current signal CS of sample circuit Rsen samplings for the output of transformer T1 vice-side windings, through sustained diode c1 and
Sustained diode c2 rectifications but the current signal filtered without output capacitance Co, the current signal CS average and output current
It is equal, therefore can equally be used as output current sampled signal.As space is limited, this specification only shows two as shown in Figures 3 and 4
Kind sample circuit Rsen position, it will be obvious to those skilled in the art that sample circuit Rsen can also be placed on transformation
The other positions of device TI secondary, to obtain the current sampling signal related to output current, the utility model is claimed interior
Appearance is defined by claims of the present utility model.
According to the LLC resonant converter 300 of 3rd embodiment, the first end for starting electric capacity Cs2 in power supply circuit 240 connects
Ground connection.It is as follows according to the operation principle of the startup power supply circuit 240：When input ac voltage Vac changes, the electric capacity
Voltage generating period change between Cs1 and electric capacity Cs2 first end, and then realize power supply.Those skilled in the art should
This is clear, the original of the first end and the LLC resonant converter of the electric capacity Cs1 started in power supply circuit 240 and electric capacity Cs2
While there is other connected modes, the circuit of all operation principles based on the startup power supply circuit 240 and then realization power supply is equal
The utility model protection within the scope of, the claimed content of the utility model using claims of the present utility model as
It is accurate.
It is identical with second embodiment according to other aspects of the LLC resonant converter of 3rd embodiment, it will not be repeated here.
Fig. 5 shows the schematic circuit of the LLC resonant converter according to the utility model fourth embodiment.The LLC is humorous
The converter 400 that shakes includes main circuit 420, isolation circuit 430, starts power supply circuit 240 and control circuit 210 as shown in Figure 2.
In the controlled resonant converter, square-wave signal generation circuit 202 includes the switching tube Q1 to Q4 of composition full-bridge circuit.Main circuit 420
Continuous current mode, discontinuous conduct mode or electric current critical conduction mode can be operated in.
The main circuit 420 of LLC resonant converter 400 includes pfc circuit 101, square-wave signal generation circuit 202, resonance electricity
Road 103, rectification circuit 104, output capacitance Co, load RL and current sampling resistor Rsen.
Pfc circuit 101 receives alternating voltage Vac, after rectified and PFC, exports DC voltage.
In square-wave signal generation circuit 202, switching tube Q1 and Q2 are connected in series in two output ends of pfc circuit 101
Between, switching tube Q3 and Q4 are connected in series between two output ends of pfc circuit 101.Switching tube Q1 first end connection PFC
The output plus terminal of circuit 101, switching tube Q1 the second end connecting valve pipe Q2 first end, switching tube Q2 the second end connection
The output negative terminal of pfc circuit 101, that is, be grounded.The output plus terminal of switching tube Q3 first end connection pfc circuit 101, switching tube
Q3 the second end connecting valve pipe Q4 first end, the output negative terminal of switching tube Q4 the second end connection pfc circuit 101, that is, connect
Ground.Switching tube Q1 to Q4 obtains drive signal VG1, VG2, VG2, VG1 from control circuit 210 respectively, so as in drive signal
The lower on or off of control.In the course of the work, switching tube Q1 and Q2 alternate conductions and shut-off, switching tube Q3 and Q4 are alternately led
Logical and shut-off, and the complementary conducting of switching tube Q3 and Q1, the complementary conducting of switching tube Q4 and Q2, strike a bargain so as to which DC voltage be changed
Flow signal.Two output ends of the full-bridge circuit are respectively switching tube Q1 and Q2 intermediate node and switching tube Q3 and Q4 centre
Node, for providing the AC signal.
Resonance circuit 103 includes resonant inductance Lr, resonant capacitance Cr and transformer T1 primary side winding.Transformer T1 is included
Two windings, i.e. primary side winding and with tapped vice-side winding.Resonant inductance Lr first end connecting valve pipe Q1 and Q2
Intermediate node, resonant inductance Lr the second end connection transformer T1 primary side windings Same Name of Ends, transformer T1 primary side windings
Different name end connection resonant capacitance Cr first end, resonant capacitance Cr the second end ground connection.
Rectification circuit 104 includes the sustained diode c1 and Dc2 being connected with transformer T1 vice-side winding.Transformer T1
Vice-side winding Same Name of Ends connection sustained diode c1 anode, transformer T1 vice-side winding different names end connection fly-wheel diode
Dc2 anode, the centre tap of transformer T1 vice-side windings connect output ground.Sustained diode c1 negative electrode and fly-wheel diode
Dc2 negative electrode is connected, and is commonly connected to output capacitance Co anode.Output capacitance Co negative terminal connection output ground.
Load RL and current sampling resistor Rsen is connected in series between output capacitance Co anode and negative terminal.Although at this
Current sampling resistor Rsen in embodiment is resistance, it should be appreciated to those skilled in the art that in alternate embodiments,
The current measuring element of similar functions can be used to substitute current sampling resistor Ren.
The control circuit 210 of LLC resonant converter 400 is connected with main circuit 420, for the secondary from main circuit 420
Obtain voltage sampling signal VS and current sampling signal CS, and the drive of the primary side switch pipe according to the two generation main circuit 420
Dynamic signal VG1 and VG2.
As shown in figure 5, the first input end of control circuit 210 is connected to current sampling resistor Rsen in main circuit 420
First end, receive current sampling signal CS.Second input of control circuit 210 is connected to output capacitance Co in main circuit 420
Anode, the first output end and the second output end of receiving voltage sampled signal VS control circuits 210 are connected to isolation circuit
430。
Isolation circuit 430 includes transformer T3.The driving transformer T3 includes five windings：N1、 N2、N3、N4、N5.
The Same Name of Ends of N1 windings is connected with the first output end of control circuit 210, and the of the different name ends of N1 windings and control circuit 210
Two output ends are connected.The Same Name of Ends of N2 windings is connected with the control terminal of switching tube Q1 in main circuit 420, the different name end of N2 windings with
Switching tube Q1 the second end is connected in main circuit 420.The different name end of N3 windings and the control terminal phase of switching tube Q2 in main circuit 420
Even, the Same Name of Ends of N3 windings is connected with the second end of switching tube Q2 in main circuit 420, that is, is grounded.The different name end of N4 windings and master
Switching tube Q3 control terminal is connected in circuit 420, the second end phase of the Same Name of Ends of N4 windings and switching tube Q3 in main circuit 420
Even.The Same Name of Ends of N5 windings is connected with the control terminal of switching tube Q4 in main circuit 420, different name end and the main circuit 420 of N5 windings
Middle switching tube Q4 the second end is connected, that is, is grounded.Isolation circuit 430 isolates the drive signal VG1 and VG2 of control circuit 210
Transmit to the input side of main circuit 420, worked for driving switch pipe Q1 to Q4.
Starting power supply circuit 240 includes electric capacity Cs1, electric capacity Cs2, diode Ds1 and diode Ds2.Electric capacity Cs1 and electric capacity
Cs2 first end connects input ac voltage Vac both ends respectively, and electric capacity Cs1 the second end is connected to diode Ds1 the moon
Pole, electric capacity Cs2 the second end are connected to diode Ds1 anode, electric capacity Cs2 the second termination output ground.Diode Ds2's
Anode is even connected with diode Ds1 negative electrode, and diode Ds2 negative electrode is connected to the feeder ear VCC of control circuit 210.When defeated
When entering alternating voltage Vac changes, flow through alternating current in electric capacity Cs1 and electric capacity Cs2, the alternating current through diode Ds1 and
Powered after diode Ds2 rectifications to the VCC of control circuit 210.
For example above according to embodiment of the present utility model, these embodiments do not have all details of detailed descriptionthe, not yet
Limit the specific embodiment that the utility model is only.Obviously, as described above, can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, be in order to preferably explain principle and practical application of the present utility model so that
Skilled artisan can be used using the utility model and the modification on the basis of the utility model well.This
The protection domain of utility model should be defined by the scope that the utility model claims are defined.
Claims (14)
- A kind of 1. mode of resonance switch converters, it is characterised in that including：Main circuit, including the first transformer and the multiple switch pipe that is connected with the first transformer primary side winding, it is the multiple DC voltage is transformed into square-wave signal by switching tube, and the main circuit is with resonance manner by the square-wave signal from the first transformer Primary side winding is transmitted to vice-side winding, and so as to transmit electric energy, the vice-side winding is connected to output end, so as to power to the load； AndControl circuit, it is connected with the main circuit, the voltage for obtaining the output voltage for characterizing the main circuit from secondary is adopted Sample signal and characterize the main circuit output current current sampling signal, and according to the voltage sampling signal and described Current sampling signal produces the drive signal of the multiple switching tube,Wherein, the control circuit obtains the voltage sampling signal and the current sampling signal in a manner of non-isolated, and With isolation method the drive signal is provided to the multiple switching tube.
- 2. mode of resonance switch converters according to claim 1, it is characterised in that the main circuit includes and the load The current sampling resistor being connected in series, the control circuit are directly connected to believe to obtain the voltage sample with the output end Number, and be directly connected to the current sampling resistor to obtain the current sampling signal.
- 3. mode of resonance switch converters according to claim 1, it is characterised in that the control circuit includes：First error amplifier, for the current sampling signal to be compared with the first reference voltage, to obtain current error Signal；Second error amplifier, for the voltage sampling signal to be compared with the second reference voltage, to obtain voltage error Signal；Selecting module, it is connected with first error amplifier and second error amplifier, for selecting the electric current One of error signal and the voltage error signal are used as thermal compensation signal；Control module, it is connected with the selecting module, for producing switch controlling signal according to the thermal compensation signal；AndDrive module, it is connected with the control module, for receiving the switch controlling signal and producing the multiple open Close the drive signal of pipe.
- 4. mode of resonance switch converters according to claim 3, it is characterised in that the selecting module includes：First diode, its negative electrode are connected to the output end of first error amplifier；AndSecond diode, its negative electrode are connected to the output end of second error amplifier,Wherein, the anode of first diode and second diode is connected to each other to provide the thermal compensation signal.
- 5. the mode of resonance switch converters according to the 1 of claim, it is characterised in that the main circuit includes：Circuit of power factor correction, for carrying out rectification and PFC to alternating voltage, to produce the DC voltage；Square-wave signal generation circuit, including the multiple switching tube, are connected with the circuit of power factor correction, for by directly Stream voltage is transformed into square-wave signal；Resonance circuit, be connected with the square-wave signal generation circuit, for resonance manner receive the square-wave signal and The primary side winding of the square-wave signal from the first transformer is transmitted to vice-side winding, so as to transmit electric energy；Rectification circuit, it is connected with the vice-side winding of the first transformer, for the square-wave signal of reception to be rectified into the output of direct current Voltage；AndOutput capacitance, for being filtered to the output voltage.
- 6. mode of resonance switch converters according to claim 5, it is characterised in that in the square-wave signal generation circuit The multiple switching tube composition half-bridge circuit or full-bridge circuit.
- 7. mode of resonance switch converters according to claim 1, it is characterised in that the control circuit is used to produce first Drive signal and the second drive signal.
- 8. mode of resonance switch converters according to claim 7, it is characterised in that also include：Isolation circuit, the isolation Circuit is connected with the control circuit, to receive first drive signal and second drive signal, and with it is described Main circuit is connected, to provide the drive signal of the multiple switching tube.
- 9. mode of resonance switch converters according to claim 8, it is characterised in that the multiple switching tube includes composition half The first switch pipe and second switch pipe of bridge, the isolation circuit include the second transformer, and second transformer has first To the tertiary winding,Wherein, the first switch pipe and the second switch pipe are sequentially connected in series feeder ear and ground in the DC voltage Between,The Same Name of Ends of first winding receives first drive signal, and different name end receives second drive signal,The Same Name of Ends of second winding is connected to the control terminal of the first switch pipe, and different name end is connected to the first switch The intermediate node of pipe and the second switch pipe,The different name end of the tertiary winding is connected to the control terminal of the second switch pipe, Same Name of Ends ground connection.
- 10. mode of resonance switch converters according to claim 8, it is characterised in that the multiple switching tube includes composition The switching tubes of first switch Guan Zhi tetra- of full-bridge, the isolation circuit include the 3rd transformer, and the 3rd transformer has the One to the 5th winding,Wherein, the first switch pipe and the second switch pipe are sequentially connected in series feeder ear and ground in the DC voltage Between,3rd switching tube and the 4th switching tube are sequentially connected in series between the feeder ear and ground of the DC voltage,The Same Name of Ends of first winding receives first drive signal, and different name end receives second drive signal,The Same Name of Ends of second winding is connected to the control terminal of the first switch pipe, and different name end is connected to the first switch The intermediate node of pipe and the second switch pipe,The different name end of the tertiary winding is connected to the control terminal of the second switch pipe, and Same Name of Ends is grounded,The different name end of 4th winding is connected to the control terminal of the 3rd switching tube, and Same Name of Ends is connected to the 3rd switch The intermediate node of pipe and the 4th switching tube,The Same Name of Ends of 5th winding is connected to the control terminal of the 4th switching tube, different name end ground connection.
- 11. mode of resonance switch converters according to claim 5, it is characterised in that also include：Start power supply circuit, use In producing supply voltage according to the alternating voltage when system starts, for being powered to the control circuit.
- 12. mode of resonance switch converters according to claim 11, it is characterised in that the startup power supply circuit includes：The first end of first electric capacity and the second electric capacity, first electric capacity and second electric capacity is used to receive alternating voltage；First commutation diode, the negative electrode of first commutation diode are connected to the second end of first electric capacity, and described The anode of one commutation diode is connected to the second end of second electric capacity and ground connection；AndSecond commutation diode, the anode of second commutation diode are connected to the second end of first electric capacity, and described The negative electrode of two rectifying tubes provides the supply voltage,Wherein, when the alternating voltage changes, voltage occurs between the first end of first electric capacity and second electric capacity Cyclically-varying so as to produce electric current, first commutation diode and second commutation diode by the current rectification into DC current is powered.
- 13. mode of resonance switch converters according to claim 11, it is characterised in that the startup power supply circuit includes：First electric capacity and the second electric capacity, the first end of first electric capacity are used to receiving alternating voltage, and the of second electric capacity One end is grounded；First commutation diode, the negative electrode of first commutation diode are connected to the second end of first electric capacity, and described The anode of one commutation diode is connected to the second end of second electric capacity and ground connection；AndSecond commutation diode, the anode of second commutation diode are connected to the second end of first electric capacity, and described The negative electrode of two rectifying tubes provides the supply voltage,Wherein, when the alternating voltage changes, voltage occurs between the first end of first electric capacity and second electric capacity Cyclically-varying so as to produce electric current, first commutation diode and second commutation diode by the current rectification into DC current is powered.
- 14. mode of resonance switch converters according to claim 1, it is characterised in that the main circuit can be operated in electricity Flow continuous mode, discontinuous conduct mode or electric current critical conduction mode.
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| CN201720909507.8U CN207098946U (en) | 2017-07-25 | 2017-07-25 | Mode of resonance switch converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107395022A (en) * | 2017-07-25 | 2017-11-24 | 杭州士兰微电子股份有限公司 | Mode of resonance switch converters and its control method |
| CN108880270A (en) * | 2018-09-19 | 2018-11-23 | 重庆线易电子科技有限责任公司 | Electric power converter control circuit |
| CN109449903A (en) * | 2018-11-22 | 2019-03-08 | 厦门芯阳科技股份有限公司 | A kind of isolated form load switch motion control device and its control method |
| CN112203381A (en) * | 2020-09-03 | 2021-01-08 | 杭州士兰微电子股份有限公司 | Dimming control circuit and control method thereof |
| CN114204817A (en) * | 2021-09-03 | 2022-03-18 | 杰华特微电子股份有限公司 | Asymmetric half-bridge flyback converter and peak current suppression method thereof |
| CN115224953A (en) * | 2022-09-21 | 2022-10-21 | 茂睿芯（深圳）科技有限公司 | Multi-output synchronous buck converter and converter control method |
| CN118137856A (en) * | 2024-05-08 | 2024-06-04 | 茂睿芯（深圳）科技有限公司 | Control device for switching power supply and switching power supply |
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- 2017-07-25 CN CN201720909507.8U patent/CN207098946U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395022A (en) * | 2017-07-25 | 2017-11-24 | 杭州士兰微电子股份有限公司 | Mode of resonance switch converters and its control method |
| CN107395022B (en) * | 2017-07-25 | 2023-08-08 | 杭州士兰微电子股份有限公司 | Resonant switching converter and control method thereof |
| CN108880270A (en) * | 2018-09-19 | 2018-11-23 | 重庆线易电子科技有限责任公司 | Electric power converter control circuit |
| CN108880270B (en) * | 2018-09-19 | 2024-05-03 | 深圳线易微电子有限公司 | Power converter control circuit |
| CN109449903A (en) * | 2018-11-22 | 2019-03-08 | 厦门芯阳科技股份有限公司 | A kind of isolated form load switch motion control device and its control method |
| CN112203381A (en) * | 2020-09-03 | 2021-01-08 | 杭州士兰微电子股份有限公司 | Dimming control circuit and control method thereof |
| CN114204817A (en) * | 2021-09-03 | 2022-03-18 | 杰华特微电子股份有限公司 | Asymmetric half-bridge flyback converter and peak current suppression method thereof |
| CN115224953A (en) * | 2022-09-21 | 2022-10-21 | 茂睿芯（深圳）科技有限公司 | Multi-output synchronous buck converter and converter control method |
| CN118137856A (en) * | 2024-05-08 | 2024-06-04 | 茂睿芯（深圳）科技有限公司 | Control device for switching power supply and switching power supply |
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