CN105375771B - The phase-shift type full-bridge converters control circuit of DC-DC supply unit - Google Patents
The phase-shift type full-bridge converters control circuit of DC-DC supply unit Download PDFInfo
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- CN105375771B CN105375771B CN201410442519.5A CN201410442519A CN105375771B CN 105375771 B CN105375771 B CN 105375771B CN 201410442519 A CN201410442519 A CN 201410442519A CN 105375771 B CN105375771 B CN 105375771B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The present invention relates to the phase-shift type full-bridge converters control circuit of one direct current/continuous-current plant, includes one first and door and one first OR gate；This first with door there is two inputs and an output end, two inputs are respectively electrically connected to the first, the 4th electronic switch of a phase-shift type full-bridge converters；First OR gate has first, second input and an output end, the first input end of first OR gate electrically connect this first with the output end of door, second input is received in the synchronous rectification switch control signal of continuous conduction mode, the output end of first OR gate is electrically connected to the synchronous rectification switch of the phase-shift type full-bridge converters, the synchronous rectification switch all can carry out conducting control when continuous conduction mode and discontinuous conduction mode by the present invention, decrease in energy loss under discontinuous conduction mode and increase conversion efficiency.
Description
Technical field
The present invention relates to a kind of converter control circuit, particularly relates to one and is applied to control one direct current/continuous-current plant
Phase-shift type full-bridge converters secondary side switches control circuit.
Background technology
It refer to shown in Fig. 4, the phase-shift type full-bridge converters 10 of prior art have a primary side and a secondary side.The phase
The primary side of shifting formula full-bridge converters 10 has the first~the 4th electronic switch Q1~Q4, an input positive terminal 11, an input negative terminal
12 and a first siding ring 13.Four electronic switch Q1~Q4 are metal oxide semiconductcor field effect transistor (Metal-
Oxide-Semiconductor Field-Effect Transistor；MOSFET), first and third electronic switch Q1, Q3
Drain electrode is electrically connected to the input positive terminal 11, and the source electrode of second, four electronic switch Q2, the Q4 are electrically connected to the input negative terminal 12, should
First electronic switch Q1 source electrode and second electronic switch Q2 drain electrode are electrically connected to the first end of the first siding ring 13,
And the 3rd electronic switch Q3 source electrode and the 4th electronic switch Q4 drain electrode are electrically connected to the of the first siding ring 13
Two ends.
The secondary side of the phase-shift type full-bridge converters 10 includes a second siding ring 14, an output plus terminal 15, one output
Negative terminal 16, one first synchronous rectification switch Q5, one second synchronous rectification switch Q6 and an outputting inductance L.First, second synchronization
Rectifier switch Q5, Q6 MOSFET.First, second synchronous rectification switch Q5, Q6 source electrode are electrically connected to the output negative terminal 16,
First synchronous rectification switch Q5 drain electrode is electrically connected to the first end of the second siding ring 14, second synchronous rectification switch Q6
Drain electrode be electrically connected to the second end of the second siding ring 14, the center tap of second siding ring 14 passes through outputting inductance L and connected
It is connected to the output plus terminal 15.
The phase-shift type full-bridge converters 10 can divide into continuous conduction mode (Continue Condition when operation
Mode；) and discontinuous conduction mode (Discontinue Condition Mode CCM；DCM).Continuous conduction mode represents should
The output current that secondary side flows through outputting inductance L is continuously on the occasion of and is not zero, and discontinuous conduction mode represents that this is secondary
Output current of the effluent through outputting inductance L is continuously on the occasion of and has null situation.
First to fourth electronic switch Q1~Q4 grid A~D and first, second synchronous rectification switch Q5, Q6's
Grid E, F are respectively electrically connected to a control integrated circuit (Integrated Circuit；IC) the first of 100 to the 6th output connects
Pin, by the first to the 6th output connecting pin of the control integrated circuit 100 export respectively the first to the 6th control signal control this
Whether are one to the 4th electronic switch Q1~Q4 and first, second synchronous rectification switch Q5, Q6 conducting, to determine the phase-shift type
The input energy of the primary side of full-bridge converters 10 is delivered to the conversion efficiency of secondary side output.And existing control integrated circuit 100
For the first to fourth electronic switch Q1~Q4 and first, second synchronous rectification switch Q5, Q6 conducting control only for
Designed under continuous conduction mode.
Refer to shown in Fig. 5, first control signal and second control signal are anti-phase, the 3rd control signal with this
Four control signals are anti-phase, and leading 90 degree of 3rd control signal of first control signal.And when continuous conduction mode, flow through
Inductance L output current IL is continuously on the occasion of and is not zero, therefore first, second synchronous rectification switch Q5, Q6 only need to be
When the inductive current direction of second siding ring 14 and output current IL are in opposite direction, control the first synchronous rectification switch Q5 or
Second synchronous rectification switch Q6 is not turned on, and to prevent the second siding ring 14 from inducing a reverse induced-current, causes to connect
This just, output negative terminal 15,16 load because reverse current damage.
For example, Fig. 6 A are refer to, in the case of one first, when the grid for there was only the first, the 4th electronic switch Q1, the Q4
Extremely high potential and when turning on, an input current Iin is flowed into by the first end of the first siding ring 13 and flowed out by its second end,
And the induced-current I that the second siding ring 14 inducessenseConnected by the second siding ring 14 and first synchronous rectification switch Q5
Flowed out at the center tap of the first end connect or the second siding ring 14, for normal, the load should be received by the output plus terminal
The electric currents of 15 outflows activate, if now turning on first synchronous rectification switch Q5, by induced-current IsenseCan be via
The first end of the secondary test coil 14 reversely flow to output negative terminal 16, causes the load to cause to damage.Therefore, in such a situation
Under, first synchronous rectification switch Q5 grid E is necessary for low potential to maintain not on-state, makes induced-current Isense
After generation, the output negative terminal 16 will not be flow to, and outputting inductance L is flowed through by the center tap of the secondary test coil 14 and extremely should
Output plus terminal 15, to provide the electric current of the load correct direction.
Similarly, Fig. 6 B are refer to, in the case of one second, when only second, third electronic switch Q2, Q4 grid are
High potential and when turning on, input current Iin is flowed into by the second end of the first siding ring 13 and flowed out by its first end, and is somebody's turn to do
The induced-current I that secondary side inducessenseDirection by the first end of the second siding ring 14 or the second siding ring 14
Entreat and flowed at tap, if now turning on second synchronous rectification switch Q6, induced-current IsenseCan be by the secondary side line
Circle 14 flows out to the output negative terminal 16 with second synchronous rectification switch Q6 the second ends being connected, and forms reverse current and causes this
Load causes to damage.Therefore, under such a situation, second synchronous rectification switch Q6 grid F is necessary for low potential, to maintain
In not on-state, make induced-current IsenseThe second synchronous rectification switch Q6 can not be flowed through and produce reverse current and flow to this
Export negative terminal 16.And in other situations, you can first, second synchronous rectification switch Q5, Q6 is all turned on reduce loss with
Improve conversion efficiency.
But when the control integrated circuit 100 of the phase-shift type full-bridge converters of prior art is only for continuous conduction mode, control
Make being Turned on/off for the first to fourth electronic switch Q1~Q4 and first, second synchronous rectification switch Q5, the Q6.And in non-
During continuous conduction mode, then directly first, second synchronous rectification switch Q5, Q6 of secondary side is all closed, only by this first,
Second synchronous rectification switch Q5, Q6 parasitic diode transmits the purpose of energy to reach, but is only passed by parasitic diode
More energy loss can be produced by passing energy, cause conversion efficiency low.Therefore the phase-shift type full-bridge converters of prior art are in non-
Switch control under continuous conduction mode is necessary further improved.
The content of the invention
Control integrated circuit in view of existing phase-shift type full-bridge converters is controlled only for continuous conduction mode,
Controlled for discontinuous conduction mode, the shortcomings that causing conversion efficiency low, it is an object of the invention to provide a direct current/straight
The phase-shift type full-bridge converters control circuit of supply unit is flowed, enables the phase-shift type full-bridge converters in continuous conduction mode and non-
During continuous conduction mode, different control is carried out respectively, and energy loss and raising are reduced during being achieved in discontinuous conduction mode
The purpose of conversion efficiency.
The technical scheme is that the phase-shift type full-bridge converters control circuit of one direct current/continuous-current plant is provided,
It is provided commonly for controlling a phase-shift type full-bridge converters with unification domination set into circuit, and the phase-shift type full-bridge converters include company
Connect first to fourth electronic switch, one first synchronous rectification switch and one second synchronous rectification switch of full bridge structure, the control
Integrated circuit has the first to the 6th output connecting pin；The phase-shift type full-bridge converters control circuit of the DC-DC supply unit
Include a first module and a second unit, wherein：
The first module includes：
One first and door, secondly input is respectively for being connected to first and the 4th output connecting pin of the control integrated circuit,
To receive the one first and the 4th control signal；And
One first OR gate, has：
One first input end, be connected to this first with the output end of door；
One second input, it is received under continuous conduction mode to control the second of the phase-shift type full-bridge converters synchronously
One second synchronous rectification switch control signal of rectifier switch；
One output end, it is connected to the control terminal of the second synchronous rectification switch of the phase-shift type full-bridge converters；
The second unit includes：
One first and door, secondly input is respectively for being connected to second and third output connecting pin of the control integrated circuit,
To receive one second and one the 3rd control signal；And
One first OR gate, has：
One first input end, it is connected to the first of the second unit and the output end of door；
One second input, it is received under continuous conduction mode the one first of the phase-shift type full-bridge converters same to control
Walk rectifier switch control signal；
One output end, it is connected to the control terminal of the first synchronous rectification switch of the phase-shift type full-bridge converters.
The phase-shift type full-bridge converters control circuit utilizes logic circuit, according to the phase-shift type full-bridge converters primary side
The control signal of first to fourth electronic switch realizes that first, second synchronous rectification of the phase-shift type full-bridge converters secondary side is opened
The conducting control of pass, continuous conduction mode is output in and in non-by the output end of the first OR gate of the first module of the control circuit
One second synchronous control signal of second synchronous rectification switch, and second by the control circuit are controlled under continuous conduction mode
The output end of first OR gate of unit is output in continuous conduction mode and controls first synchronization whole under discontinuous conduction mode
Flow one first synchronous control signal of switch.
Phase-shift type full-bridge converters control circuit of the present invention can export different controls under continuous and discontinuous conduction mode
Signal processed, it is controlled with first, second synchronous rectification switch to the phase-shift type full-bridge converters secondary side, makes the phase-shift type
Full-bridge converters can be also controlled in discontinuous conduction mode to reduce energy loss to increase conversion efficiency.And the present invention uses
Logic circuit is realized, and existing many logical integrated circuits include with door with OR gate on current market, therefore the present invention only needs
A logical integrated circuit and simple wiring is set to can be achieved, it is not necessary to the extra line that accurate electronic component or complexity are set
Line structure.
Brief description of the drawings
Fig. 1 is the circuit diagram of the first preferred embodiment of the invention.
Fig. 2 is phase-shift type full-bridge converters in the timing diagram of discontinuous conduction mode.
Fig. 3 is the circuit diagram of the second preferred embodiment of the invention.
Fig. 4 is the circuit diagram of prior art phase-shift type full-bridge converters.
Fig. 5 is phase-shift type full-bridge converters in the timing diagram of continuous conduction mode.
Fig. 6 A are the circuit diagram that phase-shift type full-bridge converters flow in the induced-current of one first situation.
Fig. 6 B are the circuit diagram that phase-shift type full-bridge converters flow in the induced-current of one second situation.
Embodiment
Coordinate schema and presently preferred embodiments of the present invention below, the present invention is expanded on further to reach predetermined goal of the invention institute
The technological means taken.
It refer to shown in Fig. 1, the phase-shift type full-bridge converters control circuit 20 of DC-DC supply unit of the present invention coordinates
The phase-shift type full-bridge converters 10 of one 26 co- controlling of control integrated circuit one, the phase-shift type full-bridge converters 10 refer to Fig. 4 institutes
The existing circuit shown, its circuit framework repeat no more.The control integrated circuit 26 has first to fourth output connecting pin OUTA
~OUTD, first to fourth output connecting pin OUTA~OUTD connect first in the phase-shift type full-bridge converters 10 respectively
Four electronic switch Q1~Q4 control terminal A~D, and first to fourth output connecting pin OUTA~OUTD export respectively one first to
Whether 4th control signal controls first to fourth electronic switch Q1~Q4 conducting.
Phase-shift type full-bridge converters control circuit 20 includes an a first module 20a and second unit 20b.
First module 20a the first preferred embodiment includes one first and door 21a, one first OR gate 22a, one second
OR gate 23a, a current detection circuit 24 and one second and door 25a.
The first and door 21a and second OR gate 23a has two inputs and an output end respectively.This first and door
21a two inputs are respectively electrically connected to the first of the control integrated circuit 26, the 4th output connecting pin OUTA, OUTD, and this
Two OR gate 23a two inputs be also respectively electrically connected to the first of the control integrated circuit 26, the 4th output connecting pin OUTA,
OUTD, to receive the first, the 4th control signal.The first OR gate 22a and the second and door 25a have one first input respectively
End, one second input and an output end.It is first defeated with door 21a that first OR gate 22a first input end is electrically connected to this
Go out end, first OR gate 22a the second input receives one under continuous conduction mode to control the phase-shift type full-bridge to change
The the second synchronous rectification switch control signal S1a whether second synchronous rectification switch Q6 of device 10 turns on, and first OR gate 22a
Output end be electrically connected to second synchronous rectification switch Q6 control terminal F, with output one controlling second synchronous rectification
The one second synchronous control signal S2a whether switch Q6 turns on.
The current detection circuit 24 is used to detecting the input or output current of primary side or secondary side, and in being continuously turned on mould
A high potential signal is exported during formula, a low-potential signal is exported when discontinuous conduction mode.This second with it is the first of door 25a defeated
Enter the output end that end is electrically connected to second OR gate 23a, the second input of the second and door 25a is electrically connected to the current detecting
Circuit 24 to receive the signal of the current detection circuit 24 output, and this second with door 25a output end be electrically connected to this second
Synchronous rectification switch Q6 control terminal F, second synchronous rectification switch Q6 is controlled to lead to be output under continuous conduction mode
The the second synchronous rectification switch control signal S1a whether led to.
Similarly, the one first of the second synchronous rectification switch Q5 of the phase-shift type full-bridge converters 10 control terminal E synchronous control
Signal S2b processed is produced by second unit 20b, and second unit 20b includes one first and door 21b, one first OR gate 22b, one
Second OR gate 23b and one second and door 25b.This first has two inputs and one defeated with door 21b and second OR gate 23b respectively
Go out end.The first of second unit 20b is respectively electrically connected to the domination set with door 21b and second OR gate 23b two inputs
Into second, third output connecting pin OUTB, OUTC of circuit 26.The first OR gate 22b and this second have one the respectively with door 25b
One input, one second input and an output end.The first input end of the second and door 25b is electrically connected to second OR gate
23b output end, its second input are electrically connected to the current detection circuit 24 to receive the current detection circuit 24 output
Signal, and this second with door 25b output end output one under continuous conduction mode controlling the phase-shift type full-bridge converters
10 the first synchronous rectification switch Q5 one first synchronous rectification switch control signal S1b.First OR gate 22b the first input
End be electrically connected to this first with door 21b output end, first OR gate 22b the second input be electronically connected to this second and door
25b output end, to receive first synchronous rectification switch control signal S1b, and first OR gate 22b output end electrically connects
To first synchronous rectification switch Q5 control terminal E, to export one to control the one first of first synchronous rectification switch Q5
Synchronous control signal S2b, whether to control the firstth synchronous rectification switch Q5 conducting.
Refer to shown in Fig. 2, for the phase-shift type full-bridge converters 10 under discontinuous conduction mode this first to fourth electricity
Sub switch Q1~Q4 control terminals A~D first to fourth control signal, outputting inductance L electric current IL and this is first, second same
Walk the timing diagram of first, second synchronous rectification switch control signal of rectifier switch Q5, Q6 control terminal E, F.First control
Signal and second control signal are anti-phase, and the 3rd control signal and the 4th control signal are anti-phase, and first control signal
Leading 90 degree of 3rd control signal.And under discontinuous conduction mode, first, second synchronous rectification switch Q5, Q6 only in
When first to fourth electronic switch Q~Q4 conductings are to transmit energy corresponding to the phase-shift type full-bridge converters 10, just turn on to subtract
Few energy loss and increase conversion efficiency.
For example, as shown in Figure 6A, when this first and the 4th electronic switch Q1, Q4 conducting when, induced-current Isense
Flowed out by the center tap of the second siding ring 14, second synchronous rectification switch Q6 is only turned under this situation, makes this
Induced-current IsenseOutflow is gone out by the center tap of the second siding ring 14, and an electrical connection is flow to after flowing through outputting inductance L
Load between the positive and negative end 15,16 of the output, then after flowing through the 6th electronic switch Q6 by the output negative terminal 16, it flow to this
Second end of second siding ring 14, and be all not turned in other periods, second synchronous rectification switch Q6, to protect this to be carried on
When outputting inductance L electric currents IL is zero, does not produce reverse current and cause the load to damage.
Similarly, as shown in Figure 6B, when second and third electronic switch Q2, Q3 are turned on, induced-current IsenseBy this
Second end of second siding ring 14 is flowed into, and first synchronous rectification switch Q5 is only turned under this situation, makes the induced-current
IsenseFlowed out by the center tap of the secondary coil 14, flow through and one is flow to after outputting inductance L to be electrically connected to the output positive and negative
Load between end 15,16, then after flowing through first synchronous rectification switch Q5 by the output negative terminal 16, it flow to the second siding ring
14 first end, and be all not turned in other periods, first synchronous rectification switch Q5, to protect this to be carried on outputting inductance L
When electric current IL is zero, does not produce reverse current and cause the load to damage.
Judge via Fig. 2 timing diagram, following truth table can be summarized：
| A | B | C | D | E | F |
| 0 | 1 | 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 0 |
| 1 | 0 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 | 0 | 0 |
| 0 | 1 | 1 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 0 |
| 1 | 0 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 | 0 | 0 |
Control terminal E, the F and first to fourth electronics for obtaining the five, the 6th electronic switch Q5, Q6 are pushed away by above truth table
Switch logical relations of the Q1~Q4 control terminal A~D under discontinuous conduction mode：
With further reference to Fig. 6 timing diagram, the phase-shift type full-bridge converters 10 can be summarized under continuous conduction mode
Five, the 6th electronic switch Q5, Q6 truth table is as follows：
Control terminal E, the F and first to fourth electronics for obtaining the five, the 6th electronic switch Q5, Q6 are pushed away by above truth table
Switch logical relations of the Q1~Q4 control terminal A~D under continuous conduction mode：
According under above-mentioned discontinuous conduction mode and continuous conduction mode, the five, the 6th electronic switch Q5, Q6 control
End E, F logical relation can design the control circuit 20 of phase-shift type full-bridge converters 10 of the present invention.
Furthermore, refer to shown in Fig. 3, the second preferred embodiment phase-shift type full-bridge converters control circuit of the invention
20 include first module 20a and second unit 20b.First module 20a have this first with door 21a and this first or
Door 22a.The control integrated circuit 26 has first, second synchronous rectification switch Q5, the Q6 being output under continuous conduction mode
First, second synchronous rectification switch control signal function, i.e. the control integrated circuit 26 further has the five, the 6th defeated
Go out pin OUTE, OUTF.In this preferred embodiment, it is UCC28950 that this, which controls the integrated circuit of integrated circuit 26 to number,.Should
First and door 21a two inputs are respectively electrically connected to the first of the integrated circuit 26, the 4th output connecting pin OUTA, OUTD,
First OR gate 22a first input end is electrically connected to the output end of the first and door 21a.And the 6th of the control integrated circuit
Output connecting pin OUTF is electrically connected to first OR gate 22a the second input, should be controlled with output under continuous conduction mode
Make the second synchronous rectification switch control signal whether the second synchronous rectification switch Q6 of the phase-shift type full-bridge converters 10 turns on
S1a to first OR gate 22a the second input.First OR gate 22a output end is electrically connected to second synchronous rectification and opened
Close Q6 control terminal F, with export the second synchronous control signal S2a control second synchronous rectification switch Q6 conducting with
It is no.
Similarly, the first synchronous rectification switch Q5 of the secondary side of phase-shift type full-bridge converters 10 control terminal E receive the
One synchronous control signal is produced by the phase-shift type full-bridge converters control circuit 20 second unit 20b.Second unit 20b has
This first with door 21b and first OR gate 22b, this first is respectively electrically connected to the control with door 21b two inputs and integrated
Second, third output connecting pin OUTB, OUTC of circuit 26, first OR gate 22b first input end be electrically connected to this first with
Door 21b output end, and the 5th output that first OR gate 22b the second input is electrically connected to the control integrated circuit 26 connects
Pin OUTE, to receive this under continuous conduction mode to control the first synchronous rectification switch of the phase-shift type full-bridge converters 10
The the first synchronous rectification switch control signal S1b whether Q5 turns on.It is first same that the output end of first OR gate 22 is electrically connected to this
Rectifier switch Q5 control terminal E is walked, controls first synchronous rectification switch Q5's to export the second synchronous control signal S2b
Whether turn on.
And when the gate used in the control circuit 20 is more, control signal is in transmission and the process of logic judgment
In, temporal delay is likely to result in, the reaction that the signal for exporting the control integrated circuit 26 can not be instant to the control
The output end of circuit 20, to carry out accurate and undelayed control to first, second synchronous rectification switch Q5, Q6, cause in
Reverse current is produced during discontinuous conduction mode damages the load.Therefore in first and second preferred embodiment of the present invention, can
A delay circuit 27 is further provided with, the delay circuit 27 is electrically connected to first to fourth output of the control integrated circuit 26
First to fourth electronic switch Q1~Q4 of pin OUTA~OUTD and the phase-shift type full-bridge converters 10 control terminal A~D it
Between.And the first of the first module 20a of the phase-shift type full-bridge converters control circuit 20 and door 21a two inputs are then direct
It is electrically connected to first and the 4th output connecting pin OUTA, OUTD of the control integrated circuit 26, second unit 20b first and door
21b two inputs are directly electrically coupled to second and third output connecting pin OUTB, OUTC of the control integrated circuit 26.Therefore should
Integrated circuit 26 is controlled to postpone control to first to fourth electronic switch Q1~Q4 of the phase-shift type full-bridge converters 10, in etc.
After the logic judgment of the control circuit 20, while control the first to fourth electronic switch Q1~Q4 and this is first, second same
Walk rectifier switch Q5, Q6.In this preferred embodiment, the delay circuit 27 is a Resistance-Capacitance delay circuit (RC delay
circuit)。
First to fourth electronics of the primary side that the first preferred embodiment of the present invention exports merely with the integrated circuit 26
Q1~Q4 control terminal A~D control signal is switched, to be implemented under continuous conduction mode and discontinuous conduction mode, all can
The function being controlled to first, second synchronous rectification switch Q5, Q6.And the control is integrated in the second preferred embodiment of the present invention
The built-in function that first, second synchronous rectification switch Q5, Q6 is controlled under continuous conduction mode of integrated circuit 26 processed, to enter
One step reduces the gate quantity in the control circuit 20, the logic circuit of the present invention is more simplified.If the integrated electricity of the control
Road has the function that first, second synchronous rectification switch Q5, Q6 is controlled under continuous conduction mode in having no, then must use
The first preferred embodiment of the present invention come be implemented under continuous conduction mode and discontinuous conduction mode can all control this
First, second synchronous rectification switch Q5, Q6 function.Therefore the present invention can also carry out the synchronous rectification under discontinuous conduction mode
The control of switch, to reduce energy loss and increase conversion efficiency.And the present invention realizes merely with simple gate, therefore,
Only need to set a logical integrated circuit with multiple gates and simple wiring to can be achieved, it is not necessary to extra to set complicated essence
Close electronic component or microprocessor, the predetermined purpose of the present invention can be reached.
Described above is only presently preferred embodiments of the present invention, not does any formal limitation to the present invention, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people
Member, in the range of technical solution of the present invention is not departed from, when the technology contents using the disclosure above make a little change or repair
The equivalent embodiment for equivalent variations is adornd, as long as being the content without departing from technical solution of the present invention, the technology according to the present invention is real
Any simple modification, equivalent change and modification that confrontation above example is made, still fall within the scope of technical solution of the present invention
It is interior.
Claims (7)
1. a kind of phase-shift type full-bridge converters control circuit of DC-DC supply unit, it is total to unification domination set into circuit
With being used to controlling a phase-shift type full-bridge converters, the phase-shift type full-bridge converters, which include, connects into the first of full bridge structure to the
Four electronic switches, one first synchronous rectification switch and one second synchronous rectification switch, the control integrated circuit have first to the
Six output connecting pins, it is characterised in that the phase-shift type full-bridge converters control circuit of the DC-DC supply unit includes one
Unit one and a second unit, wherein：
The first module includes：
One first and door, secondly individual input is respectively for being connected to first and the 4th output connecting pin of the control integrated circuit, with
The control signal of reception first and the 4th；And
One first OR gate, has：
One first input end, be connected to this first with the output end of door；
One second input, it is received under continuous conduction mode to control the one second of second synchronous rectification switch synchronization whole
Flow switch controlling signal；
One output end, it is connected to the control terminal of second synchronous rectification switch；
The second unit includes：
One first and door, secondly individual input is respectively for being connected to second and third output connecting pin of the control integrated circuit, with
Receive one second and one the 3rd control signal；And
One first OR gate, has：
One first input end, it is connected to the first of the second unit and the output end of door；
One second input, it is received under continuous conduction mode to control the one first of first synchronous rectification switch synchronization whole
Flow switch controlling signal；
One output end, it is connected to the control terminal of first synchronous rectification switch.
2. the phase-shift type full-bridge converters control circuit of DC-DC supply unit according to claim 1, its feature exist
In, a current detection circuit is further includeed, to judge when continuous conduction mode, exports a high potential signal, and sentence
Break when discontinuous conduction mode, export a low-potential signal, wherein：
The first module further includes：
One second OR gate, secondly individual input is respectively for being connected to first and the 4th output connecting pin of the control integrated circuit, with
Receive the one first and the 4th control signal；And
One second and door, have：
One first input end, it is connected to the current detection circuit；
One second input, it is connected to the output end of the second OR gate of the first module；
One output end, the second input of the first OR gate of the first module is connected to, should be under continuous conduction mode with output
To control one second synchronous rectification switch control signal of second synchronous rectification switch；
The second unit further includes：
One second OR gate, secondly individual input supplies to be connected to second and third output connecting pin of the control integrated circuit respectively；
One second and door, have：
One first input end, it is connected to the current detection circuit；
One second input, it is connected to the output end of the second OR gate of the second unit；
One output end, the second input of the first OR gate of the second unit is connected to, should be under continuous conduction mode with output
To control one first synchronous rectification switch control signal of first synchronous rectification switch.
3. the phase-shift type full-bridge converters control circuit of DC-DC supply unit according to claim 1, its feature exist
In, wherein：
Second input of the first OR gate of the first module is electrically connected to the 6th output connecting pin of the control integrated circuit, to connect
This is received under continuous conduction mode to control the second synchronous rectification switch control signal of second synchronous rectification switch；And
Second input of the first OR gate of the second unit is electrically connected to the 5th output connecting pin of the control integrated circuit, to connect
This is received under continuous conduction mode to control the first synchronous rectification switch control signal of first synchronous rectification switch.
4. the phase-shift type full-bridge converters control electricity of DC-DC supply unit according to any one of claim 1 to 3
Road, it is characterised in that further include：
One delay circuit, electrically connect first to fourth output connecting pin and first to fourth electronic switch of the control integrated circuit
Between.
5. the phase-shift type full-bridge converters control circuit of DC-DC supply unit according to claim 4, its feature exist
In the delay circuit is a Resistance-Capacitance delay circuit.
6. the phase-shift type full-bridge converters control electricity of DC-DC supply unit according to any one of claim 1 to 3
Road, it is characterised in that wherein：
First to fourth output connecting pin of the control integrated circuit exports first to fourth control signal respectively；
First control signal and second control signal are anti-phase；
3rd control signal and the 4th control signal are anti-phase；And
Leading 3rd control signal of first control signal.
7. the phase-shift type full-bridge converters control circuit of DC-DC supply unit according to claim 6, its feature exist
In leading 90 degree of 3rd control signal of first control signal.
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| CN105375771B true CN105375771B (en) | 2017-12-15 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7158392B2 (en) * | 2003-01-09 | 2007-01-02 | Renesas Technology Corp. | Switching power supply device and the semiconductor integrated circuit for power supply control |
| CN101397674A (en) * | 2008-10-19 | 2009-04-01 | 青岛双瑞防腐防污工程有限公司 | Intelligent full-bridge soft-switching potentiostat |
| TW200924356A (en) * | 2007-11-20 | 2009-06-01 | System General Corp | Synchronous regulation circuit |
| JP4466798B2 (en) * | 2000-05-26 | 2010-05-26 | サンケン電気株式会社 | DC-DC converter |
| CN102223074A (en) * | 2011-06-14 | 2011-10-19 | 辽宁省电力有限公司抚顺供电公司 | Tester of DC (direct current) power supply |
| TWI397249B (en) * | 2009-01-05 | 2013-05-21 | Spi Electronic Co Ltd | Resonant converter with phase shift output path |
| CN103401221A (en) * | 2013-07-31 | 2013-11-20 | 华南理工大学 | Phase-shifted full-bridge cycle self-protection circuit and control method thereof |
-
2014
- 2014-09-02 CN CN201410442519.5A patent/CN105375771B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4466798B2 (en) * | 2000-05-26 | 2010-05-26 | サンケン電気株式会社 | DC-DC converter |
| US7158392B2 (en) * | 2003-01-09 | 2007-01-02 | Renesas Technology Corp. | Switching power supply device and the semiconductor integrated circuit for power supply control |
| TW200924356A (en) * | 2007-11-20 | 2009-06-01 | System General Corp | Synchronous regulation circuit |
| CN101397674A (en) * | 2008-10-19 | 2009-04-01 | 青岛双瑞防腐防污工程有限公司 | Intelligent full-bridge soft-switching potentiostat |
| TWI397249B (en) * | 2009-01-05 | 2013-05-21 | Spi Electronic Co Ltd | Resonant converter with phase shift output path |
| CN102223074A (en) * | 2011-06-14 | 2011-10-19 | 辽宁省电力有限公司抚顺供电公司 | Tester of DC (direct current) power supply |
| CN103401221A (en) * | 2013-07-31 | 2013-11-20 | 华南理工大学 | Phase-shifted full-bridge cycle self-protection circuit and control method thereof |
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| CN105375771A (en) | 2016-03-02 |
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