CN107769577A - DC/DC translation circuits with protection control function - Google Patents
DC/DC translation circuits with protection control function Download PDFInfo
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- CN107769577A CN107769577A CN201711285504.2A CN201711285504A CN107769577A CN 107769577 A CN107769577 A CN 107769577A CN 201711285504 A CN201711285504 A CN 201711285504A CN 107769577 A CN107769577 A CN 107769577A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention discloses the DC/DC translation circuits with protection control function; it is provided with lower pressure rectifier filter circuit, full-bridge switch converter, PI regulations circuit, control system and output circuit; the lower pressure rectifier filter circuit connects PI regulation circuits and full-bridge switch converter respectively; control system connects full-bridge switch converter, full-bridge switch converter connection output circuit；Undervoltage lockout circuit, current comparator circuit and control module are provided with control system, the control module is connected with undervoltage lockout circuit, current comparator circuit and full-bridge switch converter respectively；For realizing power conversion, and using the triggering control of phase shifting control pattern progress circuit to be controlled, there is the features such as topological structure is succinct, and control mode is simple, conversion efficiency is high, easily realizes.
Description
Technical field
The present invention relates to the fields such as electronic technology, Technology of Power Conversion, are the DC/ with protection control function specifically
DC translation circuits.
Background technology
Power refer to object within the unit interval work done number, i.e., power be description acting speed physical quantity.
The quantity of work(is certain, and the time is shorter, and performance number is bigger.The formula for seeking power is power=work(/ time.It is fast that power characterizes work done
The physical quantity of slow degree.Institute's work is referred to as power in unit interval, is represented with P.Therefore power is equal to active force and object receiving force
The scalar product of spot speed.Power inverter is a kind of electronic equipment that certain electric current can be converted to other types electric current.
The content of the invention
It is an object of the invention to provide with protection control function DC/DC translation circuits, for realizing power conversion, and
The triggering that circuit to be controlled is carried out using phase shifting control pattern is controlled, succinct with topological structure, and control mode is simple, conversion effect
Rate is high, the features such as easily realizing.
The present invention is achieved through the following technical solutions：DC/DC translation circuits with protection control function, it is whole to be provided with low pressure
Flow filter circuit, full-bridge switch converter, PI regulations circuit, control system and output circuit, the lower pressure rectifier filter circuit
PI regulation circuits and full-bridge switch converter, control system connection full-bridge switch converter, full-bridge switch converter are connected respectively
Connect output circuit；Undervoltage lockout circuit, current comparator circuit and control module, the control are provided with control system
Module is connected with undervoltage lockout circuit, current comparator circuit and full-bridge switch converter respectively.
Further is that the present invention is better achieved, especially using following setting structures：It is provided with the control module
Integrated chip UI, output delay control circuit and oscillating circuit, the undervoltage lockout circuit, error amplifier circuit, electric current ratio
All it is connected compared with device circuit with integrated chip UI, integrated chip UI converts with output delay circuit, oscillating circuit and full-bridge switch
Device is connected；The output delay control circuit includes potentiometer W2, potentiometer W3, electric capacity C21 and electric capacity C22, potentiometer W2
It is in parallel with electric capacity C21, and integrated chip UI SETA-B pin are grounded by potentiometer W2 parallel with one another and electric capacity C21；Current potential
Device W3 and electric capacity C22 is in parallel, and integrated chip UI SETC-D pin are grounded by potentiometer W3 parallel with one another and electric capacity C22；
The oscillating circuit includes potentiometer W1, electric capacity C19 and electric capacity C20, and integrated chip UI RT pin pass through current potential parallel with one another
Device W1 and electric capacity C19 ground connection, and integrated chip UI CT pin are grounded by electric capacity C20, integrated chip UI CT pin and RAMP pin
Connect altogether；Integrated chip UI OUTA pin, OUTB pin, OUTC pin, OUTD pin is all connected with full-bridge switch converter.
Further is that the present invention is better achieved, especially using following setting structures：The full-bridge switch converter bag
The first leading-bridge, the second leading-bridge, the first lagging leg and the second lagging leg are included, the connection of the first leading-bridge the second surpasses
Preceding bridge arm, bridge arm after the second leading-bridge connection second, bridge arm after the second bridge arm connection afterwards first, the first lagging leg
Connect the first leading-bridge, integrated chip UI OUTA pin, OUTB pin, OUTC pin, OUTD pin respectively with the first leading-bridge,
Two leading-bridges, the first lagging leg and the second lagging leg are connected.Integrated chip UI OUTA pin connect the first advanced bridge
Arm, integrated chip UI OUTB pin connect the first lagging leg, and integrated chip UI OUTC pin connect the second leading-bridge, integrated
Chip UI OUTD pin connect the second lagging leg.
Further is that the present invention is better achieved, especially using following setting structures：In first leading-bridge
Switching tube S1 is provided with, electric capacity C1, and switching tube S1 grid connection collection are parallel between switching tube S1 source electrode and drain electrode
Into chip UI OUTA pin；Switching tube S3 is provided with second leading-bridge, in switching tube S3 source electrode and drain electrode
Between be parallel with electric capacity C3, and switching tube S3 grid connection integrated chip UI OUTC pin；Set in second lagging leg
Switching tube S4 is equipped with, electric capacity C4 is parallel between switching tube S4 source electrode and drain electrode, and switching tube S4 grid connection is integrated
Chip UI OUTD pin；Switching tube S2 is provided with first lagging leg, between switching tube S2 source electrode and drain electrode
It is parallel with electric capacity C2, and switching tube S2 grid connection integrated chip UI OUTB pin；The drain electrode of the switching tube S1 and switch
Pipe S2 drain electrode is connected and is connected on lower pressure rectifier filter circuit, the source electrode of the switching tube S3 and switching tube S4 source electrode
It is connected and is connected on lower pressure rectifier filter circuit, switching tube S1 source electrode connects and be connected to defeated with switching tube S3 drain electrode altogether
Go out on circuit, the drain electrode of switching tube S2 source electrode and switching tube S4 connects and is connected on output circuit altogether.Preferably, the switch
Pipe S1, switching tube S1, switching tube S3 and switching tube S4 all use IXFK150N15
Further is that the present invention is better achieved, especially using following setting structures：The lower pressure rectifier filter circuit
Including common mode inductance L1, electric capacity C5 and electric capacity C6 parallel with one another, common mode inductance L1 input side are connected by current transformer
PI adjusts circuit, one end connecting valve pipe S1 drain electrode and switching tube S2 drain electrode of electric capacity C5 and electric capacity C6 after parallel connection, and
The other end connecting valve pipe S3 source electrode and switching tube S4 source electrode of electric capacity C5 and electric capacity C6 after connection.
Further is that the present invention is better achieved, especially using following setting structures：The undervoltage lockout circuit includes
Electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C9 and electric capacity C13, electric capacity C10, electric capacity C11, electric capacity C12 are parallel with one another and connect
Between+12V power supplys and ground, integrated chip UI VREF pin are grounded by electric capacity C9, and+12V power supplys are with integrated chip UI's
UVSEL pin are connected, PWRGND pin and ground connection of the+12V power supplys by electric capacity C13 connection integrated chips UI.The integrated chip
UI UVSEL pin, VC pin and VIN pin can also connect altogether.
Further is that the present invention is better achieved, especially using following setting structures：Set in PI regulation circuits
It is equipped with amplifier chip U1, resistance R1, resistance R2, amplifier chip U2, the first RC series circuits, the 2nd RC series circuits and resistance
R10, the amplifier chip U1 output end are connected by resistance R1 with amplifier chip U2 inverting input, and resistance R2 is also
It is connected on amplifier chip U2 inverting input, amplifier chip U1 inverting input is connected with output end；Amplifier chip
U2 in-phase input end ground connection, connects the first RC series circuits, amplifier between amplifier chip U2 inverting input and output end
Chip U2 output end passes through resistance R10 connection integrated chips UI'sEnd, and integrated chip UIGone here and there by the 2nd RC at end
Join circuit connection integrated chip UI COMP pin；The first RC series circuits include the resistance R7 and electric capacity C14 being serially connected,
And electric capacity C14 non-connects end altogether connection amplifier chip U2 output end, resistance R7 non-connects end altogether connection amplifier chip U2's is anti-
Phase input；The 2nd RC series circuits include the resistance R11 and electric capacity C16 being serially connected, and electric capacity C16 non-connects end altogether
Connect integrated chip UI COMP pin；Power supply circuit is also associated with amplifier chip U2 output end, and power supply circuit includes
The resistance R9 and electric capacity C15 being serially connected, resistance R9 connect amplifier chip U2 output circuit with electric capacity C15 connects end altogether, and
Resistance the R9 connection of non-connects end altogether power supply VCC, electric capacity C15 non-connects end altogether ground connection.
Further is that the present invention is better achieved, especially using following setting structures：In the current comparator circuit
It is provided with the first comparison circuit, the second comparison circuit, resistance R8, electric capacity C17, resistance R12 and electric capacity C18, the first comparison circuit
Integrated chip UI CS pin are all connected by resistance R8 with the second comparison circuit, electric capacity C17 and resistance R12 are connected in parallel on integrated chip
Between UI CS pin and GND pin, the GND pin and ground connection of integrated chip UI SS pin by electric capacity C18 connection integrated chips UI；Institute
Stating the first comparison circuit includes amplifier chip U3, resistance R4, amplifier chip U4, resistance R3 and diode D9, and described second compares
Circuit includes amplifier chip U5, resistance R5, amplifier chip U6, resistance R6 and diode D10, and amplifier chip U3 output end passes through
Resistance R4 connection amplifier chips U4 inverting input, amplifier chip U3 inverting input and output end connect altogether, and resistance R3 is simultaneously
It is associated between amplifier chip U4 inverting input and output end, amplifier chip U4 output end passes through diode D9 connection resistance
R8 input side；Amplifier chip U5 output end is connected by resistance R5 with amplifier chip U6 inverting input, amplifier core
Piece U5 inverting input and output end is connect altogether, and resistance R6 is connected in parallel between amplifier chip U6 inverting input and output end,
The input side that amplifier chip U6 output end passes through diode D10 connection resistance R8.Preferably, amplifier chip U1, amplifier chip
U2, amplifier chip U3, amplifier chip U4, amplifier chip U5, amplifier chip U6 are built using two panels four high guaily unit chip, further
Four high guaily unit chip uses LM324.
Further is that the present invention is better achieved, especially using following setting structures：The output circuit includes transformation
Device T, electric capacity C7, diode D5, diode D6, diode D7, diode D8, diode D11, diode D12, diode D13,
Diode D14, electric capacity C8, electric capacity C9, inductance L2 and DC/DC converter, the first end connecting valve pipe S2 of transformer T primary sides
Source electrode, the source electrode that the second end of transformer T primary sides passes through electric capacity C7 connecting valve pipes S1；Diode D5, diode D7, two
Pole pipe D13 and diode D11 are sequentially connected with, and diode D6, diode D8, diode D14 and diode D12 are sequentially connected with, and two
Pole pipe D5 non-connects end altogether connection diode D6 non-connects end altogether, diode D11 non-connects end altogether connection diode D12's is non-common
End is connect, diode D5 is connected with diode D7 holds the first end for the first secondary end for connecting transformer T, and transformer T is for the first time
The end that the second end connection diode D6 at level end is connected with diode D8；Diode D13 is connected with diode D11 holds connection
The first end at transformer T second subprime end, the second end connection diode D14 and diode D12 at transformer T second subprimes end
The end being connected；Electric capacity C8, inductance L2 and electric capacity C9, which are sequentially connected with, forms π type LC wave filters, and diode D5 and diode D6
It is connected and holds the end that is connected with electric capacity C8 and inductance L2 to be connected with each other, diode D11 is connected with diode D12 is held and electric capacity C8
Be connected end interconnection with electric capacity C9, and electric capacity C9 is connected as the output end of π type LC wave filters with DC/DC converters.
The preferable diode D5, diode D6, diode D7, diode D8, diode D11, diode D12, diode D13,
Diode D14 preferably uses 470 μ F electric capacity using fast recovery diode DSE130-12, the electric capacity C7 as capacitance,
Common mode inductance L1 preferably uses 3mH inductance.
Further is that the present invention is better achieved, especially using following setting structures：The integrated chip UI uses PWM
Controller UC3879.
The present invention compared with prior art, has advantages below and beneficial effect：
The present invention is used to realize power conversion, and the triggering control of circuit to be controlled, tool are carried out using phase shifting control pattern
Have that topological structure is succinct, control mode is simple, conversion efficiency is high, the features such as easily realizing.
The present invention is constant with switching frequency, can be that the switching tube of circuit to be controlled realize ZVT, so as to reach
To the effect for reducing switching loss raising switching frequency.
The present invention can realize under-voltage locking, overcurrent protection function.
The present invention utilizes the primary side leakage inductance of high frequency transformer, power MOSFET external electric capacity in parallel to realize that no-voltage is opened
Close, the program is simple, efficiently, easily realizes.
The present invention has the characteristics that function admirable, efficiency high, power density are big.
Switching tube of the present invention realizes ZVT, reduces the switching loss of device, and efficiency has reached 93%, together
When whole circuit power density also increased.
Brief description of the drawings
Fig. 1 is circuit diagram of the present invention.
Fig. 2 is control system circuit figure of the present invention.
Embodiment
The present invention is described in further detail with reference to embodiment, but the implementation of the present invention is not limited to this.
Embodiment 1：
DC/DC translation circuits with protection control function, carried out for realizing power conversion, and using phase shifting control pattern
The triggering control of circuit to be controlled, has the features such as topological structure is succinct, and control mode is simple, conversion efficiency is high, easily realizes, such as
Shown in Fig. 1, Fig. 2, especially using following setting structures：It is provided with lower pressure rectifier filter circuit, full-bridge switch converter, PI regulations
Circuit, control system and output circuit, the lower pressure rectifier filter circuit connect PI regulation circuits and full-bridge switch conversion respectively
Device, control system connection full-bridge switch converter, full-bridge switch converter connection output circuit；It is provided with control system deficient
Press lock-in circuit, current comparator circuit and control module, the control module respectively with undervoltage lockout circuit, current comparator
Circuit and full-bridge switch converter are connected.
Embodiment 2：
The present embodiment is further optimized on the basis of above-described embodiment, and as shown in Figure 1 and Figure 2, further is more preferable
The present invention is realized on ground, especially using following setting structures：Integrated chip UI, output delay control are provided with the control module
Circuit and oscillating circuit, the undervoltage lockout circuit, error amplifier circuit, current comparator circuit all with integrated chip UI phases
Connection, integrated chip UI are connected with output delay circuit, oscillating circuit and full-bridge switch converter；The output delay control
Circuit includes potentiometer W2, potentiometer W3, electric capacity C21 and electric capacity C22, and potentiometer W2 and electric capacity C21 are in parallel, and integrated chip UI
SETA-B pin pass through potentiometer W2 parallel with one another and electric capacity C21 ground connection；Potentiometer W3 and electric capacity C22 is in parallel, and integrated core
Piece UI SETC-D pin are grounded by potentiometer W3 parallel with one another and electric capacity C22；The oscillating circuit includes potentiometer W1, electricity
Hold C19 and electric capacity C20, integrated chip UI RT pin are grounded by potentiometer W1 parallel with one another and electric capacity C19, and integrated chip
UI CT pin are grounded by electric capacity C20, and integrated chip UI CT pin and RAMP pin connect altogether；Integrated chip UI OUTA pin, OUTB
Pin, OUTC pin, OUTD pin are all connected with full-bridge switch converter.
Embodiment 3：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：The full-bridge switch converter includes the first leading-bridge, second
Leading-bridge, the first lagging leg and the second lagging leg, the first leading-bridge connect the second leading-bridge, the second leading-bridge
Bridge arm after connection second, bridge arm after the second bridge arm connection afterwards first, the first lagging leg connect the first leading-bridge, collection
Lagged respectively with the first leading-bridge, the second leading-bridge, first into chip UI OUTA pin, OUTB pin, OUTC pin, OUTD pin
Bridge arm and the second lagging leg are connected.Integrated chip UI OUTA pin connect the first leading-bridge, integrated chip UI OUTB
Pin connects the first lagging leg, and integrated chip UI OUTC pin connect the second leading-bridge, integrated chip UI OUTD pin connection
Second lagging leg.
Embodiment 4：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：Switching tube S1 is provided with first leading-bridge, is being opened
Close and electric capacity C1 is parallel between pipe S1 source electrode and drain electrode, and switching tube S1 grid connection integrated chip UI OUTA pin；
Switching tube S3 is provided with second leading-bridge, electric capacity C3 is parallel between switching tube S3 source electrode and drain electrode, and open
Close pipe S3 grid connection integrated chip UI OUTC pin；Switching tube S4 is provided with second lagging leg, is being switched
Electric capacity C4, and switching tube S4 grid connection integrated chip UI OUTD pin are parallel between pipe S4 source electrode and drain electrode；Institute
State and switching tube S2 is provided with the first lagging leg, electric capacity C2 is parallel between switching tube S2 source electrode and drain electrode, and switch
Pipe S2 grid connection integrated chip UI OUTB pin；The drain electrode of the switching tube S1 is connected and connected with switching tube S2 drain electrode
It is connected on lower pressure rectifier filter circuit, the source electrode of the switching tube S3 is connected with switching tube S4 source electrode and to be connected to low pressure whole
Flow on filter circuit, switching tube S1 source electrode connects and is connected on output circuit altogether with switching tube S3 drain electrode, switching tube S2's
Source electrode and switching tube S4 drain electrode connect and are connected on output circuit altogether.Preferably, the switching tube S1, switching tube S1, switch
Pipe S3 and switching tube S4 all uses IXFK150N15
Embodiment 5：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：The lower pressure rectifier filter circuit includes common mode inductance L1, mutually
Electric capacity C5 and electric capacity C6 in parallel, common mode inductance L1 input side connect PI by current transformer and adjust circuit, after in parallel
Electric capacity C5 and electric capacity C6 one end connecting valve pipe S1 drain electrode and switching tube S2 drain electrode, electric capacity C5 and electric capacity C6 after parallel connection
Other end connecting valve pipe S3 source electrode and switching tube S4 source electrode.
Embodiment 6：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：The undervoltage lockout circuit includes electric capacity C10, electric capacity C11, electricity
Hold C12, electric capacity C9 and electric capacity C13, electric capacity C10, electric capacity C11, electric capacity C12 is parallel with one another and is connected to+12V power supplys and ground
Between, integrated chip UI VREF pin are grounded by electric capacity C9, and+12V power supplys are connected with integrated chip UI UVSEL pin ,+12V
PWRGND pin and ground connection of the power supply by electric capacity C13 connection integrated chips UI.The UVSEL pin of the integrated chip UI, VC pin and
VIN pin can also connect altogether.
Embodiment 7：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：Amplifier chip U1, resistance are provided with PI regulation circuits
R1, resistance R2, amplifier chip U2, the first RC series circuits, the 2nd RC series circuits and resistance R10, the amplifier chip U1's
Output end is connected by resistance R1 with amplifier chip U2 inverting input, and resistance R2 is also connected to the anti-of amplifier chip U2
On phase input, amplifier chip U1 inverting input is connected with output end；Amplifier chip U2 in-phase input end ground connection, fortune
Put the first RC series circuits of connection, amplifier chip U2 output end between chip U2 inverting input and output end and pass through resistance
R10 connection integrated chips UI'sEnd, and integrated chip UIEnd connects integrated chip UI's by the 2nd RC series circuits
COMP pin；The first RC series circuits include the resistance R7 and electric capacity C14 being serially connected, and electric capacity C14 non-connects end altogether connects
Connect amplifier chip U2 output end, resistance R7 non-connects end altogether connection amplifier chip U2 inverting input；The 2nd RC strings
Connection circuit includes the resistance R11 and electric capacity C16 being serially connected, and electric capacity C16 non-connects end altogether connection integrated chip UI COMP
Pin；It is also associated with power supply circuit in amplifier chip U2 output end, and power supply circuit includes the resistance R9 and electricity that are serially connected
Hold C15, resistance R9 connects amplifier chip U2 output circuit, and resistance R9 non-connects end altogether connection with electric capacity C15 connects end altogether
Power supply VCC (preferably uses+12V), electric capacity C15 non-connects end altogether ground connection.
Embodiment 8：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：Be provided with the current comparator circuit the first comparison circuit,
Second comparison circuit, resistance R8, electric capacity C17, resistance R12 and electric capacity C18, the first comparison circuit and the second comparison circuit all pass through
Resistance R8 connection integrated chips UI CS pin, electric capacity C17 and resistance R12 are connected in parallel between integrated chip UI CS pin and GND pin,
GND pin and ground connection of the integrated chip UI SS pin by electric capacity C18 connection integrated chips UI；First comparison circuit includes fortune
Chip U3, resistance R4, amplifier chip U4, resistance R3 and diode D9 are put, second comparison circuit includes amplifier chip U5, electricity
The output end for hindering R5, amplifier chip U6, resistance R6 and diode D10, amplifier chip U3 passes through resistance R4 connection amplifier chips U4
Inverting input, amplifier chip U3 inverting input and output end connect altogether, and resistance R3 is connected in parallel on the anti-phase of amplifier chip U4
Between input and output end, input side that amplifier chip U4 output end passes through diode D9 connection resistance R8；Amplifier chip
U5 output end is connected by resistance R5 with amplifier chip U6 inverting input, amplifier chip U5 inverting input and defeated
Go out end to connect altogether, resistance R6 is connected in parallel between amplifier chip U6 inverting input and output end, and amplifier chip U6 output end is led to
Cross diode D10 connection resistance R8 input side.Preferably, amplifier chip U1, amplifier chip U2, amplifier chip U3, amplifier core
Piece U4, amplifier chip U5, amplifier chip U6 are built using two panels four high guaily unit chip, and further four high guaily unit chip uses LM324.
When setting, it is preferred that the magnitude of voltage of amplifier chip U3 in-phase input end access actual measurement, amplifier chip U5's is anti-
The current value of phase input access actual measurement, reference voltage value is accessed in amplifier chip U4 in-phase input end, in amplifier chip U6
In-phase input end access reference current value, measured value and a reference value be compared in two pieces of amplifier chips (U4, U6), two poles
Pipe D9 and diode D10 negative pole are connected with resistance R8.
Embodiment 9：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：The output circuit includes transformer T, electric capacity C7, diode
D5, diode D6, diode D7, diode D8, diode D11, diode D12, diode D13, diode D14, electric capacity C8,
Electric capacity C9, inductance L2 and DC/DC converter, the first end connecting valve pipe S2 of transformer T primary sides source electrode, at the beginning of transformer T
The source electrode that second end at level end passes through electric capacity C7 connecting valve pipes S1；Diode D5, diode D7, diode D13 and diode
D11 is sequentially connected with, and diode D6, diode D8, diode D14 and diode D12 are sequentially connected with, diode D5 non-connects end altogether
Connect diode D6 non-connects end altogether, diode D11 non-connects end altogether connection diode D12 non-connects end altogether, diode D5 with
Diode D7, which is connected, holds the first end for the first secondary end for connecting transformer T, the second end connection of the secondary ends of transformer T first
The end that diode D6 is connected with diode D8；Diode D13 is connected with diode D11 to be held second of connection transformer T
The first end at level end, second end at transformer T second subprimes end connect the end that diode D14 is connected with diode D12；Electric capacity
C8, inductance L2 and electric capacity C9 be sequentially connected with form π type LC wave filters, and diode D5 be connected with diode D6 end and electric capacity C8
Be connected end interconnection with inductance L2, and diode D11 is connected with diode D12 holds the end that is connected with electric capacity C8 and electric capacity C9
It is connected with each other, and electric capacity C9 is connected as the output end of π type LC wave filters with DC/DC converters.The preferable diode
D5, diode D6, diode D7, diode D8, diode D11, diode D12, diode D13, diode D14 are using quick
Recovery diode DSE130-12, the electric capacity C7 preferably use 470 μ F electric capacity as capacitance, and common mode inductance L1 is preferably adopted
With 3mH inductance.
Embodiment 10：
The present embodiment is further optimized on the basis of any of the above-described embodiment, as shown in Figure 1 and Figure 2, is further
The present invention is better achieved, especially using following setting structures：The integrated chip UI uses PWM controller UC3879.
The present invention concrete principle be：
Power switch pipe (switching tube) S1~S4 and diode (D1-D4) the composition full-bridge switch converter being internally integrated,
S1 and S3 composition leading-bridges, S2 and S4 composition lagging legs, S1~S4 is in parasitic capacitance, external capacitor C1~C4 and transformer
(T) the acting frequency resonance of leakage inductance, realizes ZVT.Electric capacity C7 is capacitance, can effectively prevent high frequency transformer
The D.C. magnetic biasing of (transformer T).Low-voltage direct side filter capacitor is C5, C6, and L1 is common mode inductance.
The input side current value detected in real time with command current value PI regulation circuit in compares, obtained error signal by
Control system generates the trigger pulse of full-bridge switch converter in real time；In specific application, control system carries out current constant control.
The control system of the present invention realizes ZVT using phase-shift control mode.In design, the two of each bridge arm
Individual switching tube differs one into 180 ° of complementary conductings (the same switching tube of bridge arm two has a dead time), the Trigger Angle of two bridge arms
Phase, i.e. phase shifting angle, output voltage can be adjusted by adjusting phase shifting angle.Transformer T primary current is given when switching tube turns off
The shunt capacitance charging of on-off switching tube, meanwhile, the shunt capacitance electric discharge for the switching tube that same bridge arm will be opened；When shut-off is opened
The shunt capacitance voltage of pipe is closed when being charged to input direct voltage, the integrated anti-paralleled diode of the switching tube that will be opened is natural
Conducting, at this moment the switching tube realizes that no-voltage is open-minded.When switching tube turns off, due to the presence of shunt capacitance, the switching tube realizes zero
Shen pressure shut-off.
In design, the main control chip (UI) of control system uses the modified that phase-shift controller UC3879 is UC3875,
The integrated circuit provides all necessary control, decoding, protection and driving function, can be independently programmable the delay of control time,
Dead time is provided before every output stage switch pipe conducting, is to realize that ZVS allows some leeway in each resonant switch section, total
Output switch frequency includes under-voltage locking, overcurrent protection up to 300kHz, defencive function, and it is applied to voltage mode control or peak value
Current-mode control.Under-voltage locking level is selected according to UVSEL ends state, is preferably provided with two predefined threshold values：If
UVSEL ends are floated, then chip UI starts in supply voltage more than 15.25V；If UVSEL termination VIN ends, are opened in 10.75V
It is dynamic.Hold as error amplifier reverse input end, indirect R, C compensating element, (resistance R11 and electric capacity of the end with COMP ends
C16).CS ends are the in-phase input ends of current comparator, and its end of oppisite phase is preferably provided to 2.0V and 2.5V in the inside of chip；When
When the input pin is more than 2.0V, for output voltage error amplifier by more than the voltage at RAMP ends, phase shifting angle will be limited in a base
In this value, when the input pin is more than 2.5V, output end shut-off.If the input pin exceedes 2.5V DC voltage, output
Hold invalid and keep low level, therefore use the pin as voltage, the input of current protection.UI outputs control signals to switch
On the grid of pipe.
It is described above, be only presently preferred embodiments of the present invention, any formal limitation not done to the present invention, it is every according to
Any simply modification, the equivalent variations made according to the technical spirit of the present invention to above example, each fall within the protection of the present invention
Within the scope of.
Claims (10)
1. the DC/DC translation circuits with protection control function, it is characterised in that：It is provided with lower pressure rectifier filter circuit, full-bridge is opened
Converter, PI regulations circuit, control system and output circuit are closed, the lower pressure rectifier filter circuit connects PI regulation circuits respectively
With full-bridge switch converter, control system connection full-bridge switch converter, full-bridge switch converter connection output circuit；Controlling
Be provided with undervoltage lockout circuit, current comparator circuit and control module in system, the control module respectively with under-voltage locking
Circuit, current comparator circuit and full-bridge switch converter are connected.
2. the DC/DC translation circuits of band protection control function according to claim 1, it is characterised in that：The control mould
Integrated chip UI, output delay control circuit and oscillating circuit, the undervoltage lockout circuit, error amplifier electricity are provided with block
Road, current comparator circuit are all connected with integrated chip UI, integrated chip UI and output delay circuit, oscillating circuit and full-bridge
Switch converters are connected；The output delay control circuit includes potentiometer W2, potentiometer W3, electric capacity C21 and electric capacity C22,
Potentiometer W2 and electric capacity C21 is in parallel, and integrated chip UI SETA-B pin are connect by potentiometer W2 and electric capacity C21 parallel with one another
Ground；Potentiometer W3 and electric capacity C22 is in parallel, and integrated chip UI SETC-D pin pass through potentiometer W3 parallel with one another and electric capacity
C22 is grounded；The oscillating circuit includes potentiometer W1, electric capacity C19 and electric capacity C20, and integrated chip UI RT pin pass through mutually simultaneously
Potentiometer W1 and electric capacity the C19 ground connection of connection, and integrated chip UI CT pin are grounded by electric capacity C20, integrated chip UI CT pin
Connect altogether with RAMP pin；Integrated chip UI OUTA pin, OUTB pin, OUTC pin, OUTD pin is all connected with full-bridge switch converter.
3. the DC/DC translation circuits of band protection control function according to claim 2, it is characterised in that：The full-bridge is opened
Closing converter includes the first leading-bridge, the second leading-bridge, the first lagging leg and the second lagging leg, the first leading-bridge
Connect the second leading-bridge, bridge arm after the second leading-bridge connection second, bridge arm after bridge arm connection first after second, the
One lagging leg connects the first leading-bridge, and integrated chip UI OUTA pin, OUTB pin, OUTC pin, OUTD pin are respectively with first
Leading-bridge, the second leading-bridge, the first lagging leg and the second lagging leg are connected.
4. the DC/DC translation circuits of band protection control function according to claim 3, it is characterised in that：Described first
Switching tube S1 is provided with leading-bridge, is parallel with electric capacity C1 between switching tube S1 source electrode and drain electrode, and switching tube S1
Grid connection integrated chip UI OUTA pin；Switching tube S3 is provided with second leading-bridge, in switching tube S3 source
Electric capacity C3, and switching tube S3 grid connection integrated chip UI OUTC pin are parallel between pole and drain electrode；It is stagnant described second
Switching tube S4 is provided with bridge arm afterwards, electric capacity C4, and switching tube S4 grid are parallel between switching tube S4 source electrode and drain electrode
Pole connection integrated chip UI OUTD pin；Switching tube S2 is provided with first lagging leg, in switching tube S2 source electrode
Electric capacity C2, and switching tube S2 grid connection integrated chip UI OUTB pin are parallel between drain electrode；The switching tube S1's
Drain electrode is connected and is connected on lower pressure rectifier filter circuit with switching tube S2 drain electrode, the source electrode and switch of the switching tube S3
Pipe S4 source electrode is connected and is connected on lower pressure rectifier filter circuit, and switching tube S1 source electrode connects altogether with switching tube S3 drain electrode
And be connected on output circuit, the drain electrode of switching tube S2 source electrode and switching tube S4 connects and is connected on output circuit altogether.
5. the DC/DC translation circuits of band protection control function according to claim 4, it is characterised in that：The low pressure is whole
Stream filter circuit includes common mode inductance L1, electric capacity C5 and electric capacity C6 parallel with one another, and common mode inductance L1 input side passes through electric current
Transformer connection PI regulation circuits, one end connecting valve pipe S1 of electric capacity C5 and electric capacity C6 after parallel connection drain electrode and switching tube S2
Drain electrode, it is in parallel after electric capacity C5 and electric capacity C6 other end connecting valve pipe S3 source electrode and switching tube S4 source electrode.
6. the DC/DC translation circuits of band protection control function according to claim 2, it is characterised in that：The under-voltage lock
Determining circuit includes electric capacity C10, electric capacity C11, electric capacity C12, electric capacity C9 and electric capacity C13, and electric capacity C10, electric capacity C11, electric capacity C12 are mutual
In parallel and be connected between+12V power supplys and ground, integrated chip UI VREF pin are grounded by electric capacity C9 ,+12V power supplys with it is integrated
Chip UI UVSEL pin are connected, PWRGND pin and ground connection of the+12V power supplys by electric capacity C13 connection integrated chips UI.
7. the DC/DC translation circuits of band protection control function according to claim 2, it is characterised in that：Adjusted in the PI
Economize on electricity is provided with amplifier chip U1, resistance R1, resistance R2, amplifier chip U2, the first RC series circuits, the 2nd RC series electricals in road
Road and resistance R10, the amplifier chip U1 output end are connected by resistance R1 with amplifier chip U2 inverting input, and
Resistance R2 is also connected on amplifier chip U2 inverting input, and amplifier chip U1 inverting input is connected with output end；
Amplifier chip U2 in-phase input end ground connection, connects the first RC series electricals between amplifier chip U2 inverting input and output end
Road, amplifier chip U2 output end pass through resistance R10 connection integrated chips UI'sEnd, and integrated chip UIEnd passes through
2nd RC series circuits connection integrated chip UI COMP pin；The first RC series circuits include the resistance R7 that is serially connected and
Electric capacity C14, and electric capacity C14 non-connects end altogether connection amplifier chip U2 output end, resistance R7 non-connects end altogether connection amplifier core
Piece U2 inverting input；The 2nd RC series circuits include the resistance R11 and electric capacity C16 that are serially connected, and electric capacity C16
Non- connects end altogether connection integrated chip UI COMP pin；Power supply circuit is also associated with amplifier chip U2 output end, and is powered
Circuit includes the resistance R9 and electric capacity C15 being serially connected, and resistance R9 connects amplifier chip U2 output with electric capacity C15 connects end altogether
Circuit, and the resistance R9 connection of non-connects end altogether power supply VCC, electric capacity C15 non-connects end altogether ground connection.
8. the DC/DC translation circuits of band protection control function according to claim 2, it is characterised in that：The electric current ratio
Compared with being provided with the first comparison circuit, the second comparison circuit, resistance R8, electric capacity C17, resistance R12 and electric capacity C18 in device circuit,
One comparison circuit and the second comparison circuit are all in parallel by resistance R8 connection integrated chips UI CS pin, electric capacity C17 and resistance R12
Between integrated chip UI CS pin and GND pin, GND that integrated chip UI SS pin pass through electric capacity C18 connection integrated chips UI
Pin and ground connection；First comparison circuit includes amplifier chip U3, resistance R4, amplifier chip U4, resistance R3 and diode D9, institute
Stating the second comparison circuit includes amplifier chip U5, resistance R5, amplifier chip U6, resistance R6 and diode D10, amplifier chip U3's
By resistance R4 connection amplifier chips U4 inverting input, amplifier chip U3 inverting input and output end are total to output end
Connect, resistance R3 is connected in parallel between amplifier chip U4 inverting input and output end, and amplifier chip U4 output end passes through two poles
Pipe D9 connection resistance R8 input side；The inverting input phase that amplifier chip U5 output end passes through resistance R5 and amplifier chip U6
Connection, amplifier chip U5 inverting input and output end connect altogether, resistance R6 be connected in parallel on amplifier chip U6 inverting input and
Between output end, input side that amplifier chip U6 output end passes through diode D10 connection resistance R8.
9. the DC/DC translation circuits of the band protection control function according to claim any one of 4-6, it is characterised in that：Institute
Stating output circuit includes transformer T, electric capacity C7, diode D5, diode D6, diode D7, diode D8, diode D11, two
Pole pipe D12, diode D13, diode D14, electric capacity C8, electric capacity C9, inductance L2 and DC/DC converter, transformer T primary sides
First end connecting valve pipe S2 source electrode, the source electrode that the second end of transformer T primary sides passes through electric capacity C7 connecting valve pipes S1；Two
Pole pipe D5, diode D7, diode D13 and diode D11 are sequentially connected with, diode D6, diode D8, diode D14 and two
Pole pipe D12 is sequentially connected with, diode D5 non-connects end altogether connection diode D6 non-connects end altogether, diode D11 non-connects end altogether
Connect diode D12 non-connects end altogether, diode D5 be connected with diode D7 end connect transformer T the first secondary end the
One end, the second end of the secondary ends of transformer T first connect the end that diode D6 is connected with diode D8；Diode D13 and two
Pole pipe D11, which is connected, holds the first end at the second subprime end for connecting transformer T, the second end connection at transformer T second subprimes end
The end that diode D14 is connected with diode D12；Electric capacity C8, inductance L2 and electric capacity C9, which are sequentially connected with, forms π type LC wave filters,
And the diode D5 ends that are connected with diode D6 are connected end interconnection with electric capacity C8 and inductance L2, diode D11 and two poles
Pipe D12, which is connected, holds the end that is connected with electric capacity C8 and electric capacity C9 to be connected with each other, and output ends of the electric capacity C9 as π type LC wave filters
It is connected with DC/DC converters.
10. the DC/DC translation circuits of the band protection control function according to claim any one of 2-8, it is characterised in that：Institute
State integrated chip UI and use PWM controller UC3879.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711285504.2A CN107769577A (en) | 2017-12-07 | 2017-12-07 | DC/DC translation circuits with protection control function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711285504.2A CN107769577A (en) | 2017-12-07 | 2017-12-07 | DC/DC translation circuits with protection control function |
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| CN112506041A (en) * | 2020-11-19 | 2021-03-16 | 合肥工业大学 | PI controller and DC/DC converter |
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