CN106685201A - Switch circuit control method and switch circuit - Google Patents
Switch circuit control method and switch circuit Download PDFInfo
- Publication number
- CN106685201A CN106685201A CN201611185327.6A CN201611185327A CN106685201A CN 106685201 A CN106685201 A CN 106685201A CN 201611185327 A CN201611185327 A CN 201611185327A CN 106685201 A CN106685201 A CN 106685201A
- Authority
- CN
- China
- Prior art keywords
- switch pipe
- synchro switch
- circuit
- synchro
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000000758 substrate Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 8
- 230000001939 inductive effect Effects 0.000 description 17
- 230000005611 electricity Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a switch circuit control method and a switch circuit. According to the invention, through the arrangement of the connection manner of a synchronous switch tube's body diode, the pointing direction of the synchronous switch tube's body diode is changed and then, through the control of the power switch tube and the grating voltage of the synchronous switch tube, it is possible to realize: 1) during the startup process of the switch circuit, the output voltage begins to rise from zero and the impact current is not started up so as to prevent the components in the circuit from being damaged; 2) during the normal working process of the switch circuit, it is possible to control that the output voltage is above the input voltage and to control that the output voltage is below the input voltage; and 3) during the closed state of the circuit, the input end and the output end are separated completely, which means that in case of circuit fault, effective protection can be available to the circuit so as to increase the efficiency and the reliability of the circuit.
Description
Technical field
The present invention relates to field of switch power, more particularly, it relates to a kind of control method of on-off circuit and switch electricity
Road.
Background technology
The schematic diagram of synchronous rectified boost circuit of the prior art is as shown in figure 1, the power stage electricity of the booster circuit
Road include inductance L1, power switch pipe M1 (by taking nmos switch pipe as an example) and synchro switch pipe M2 (by taking PMOS switch pipe as an example),
Input capacitance C1 and output capacitance C2, inductance L1 two ends are connected on respectively DC input voitage VIN positive poles and nmos switch pipe M1
Drain electrode, the source ground of nmos switch pipe M1, the drain electrode of PMOS switch pipe M2 connects the drain electrode of nmos switch pipe M1, PMOS switch pipe
The source electrode of M2 connects output voltage VO UT positive pole, the minus earth of output voltage VO UT, and switching tube M1, M2 are by pwm signal control
On off state is reaching the purpose of controlled output voltage VOUT.
However, above-mentioned booster circuit is suffered from the drawback that：First, in system electrification moment, input voltage VIN and output
Voltage VOUT pressure reduction than larger, by the body diode of inductance L1, PMOS switch pipe M2 to output capacitance C2 filled by input voltage VIN
Electricity, larger input voltage can form dash current, and damage is likely to result in component, reduce system reliability；Second,
Circuit in the course of the work can only controlled output voltage VOUT be higher than input voltage VIN；3rd, when system stalls, by
In the presence of the body diode of PMOS switch pipe M2 so that the low-impedance path of input to outfan cannot completely cut through.Such as
Fruit is broken down (such as output short-circuit), and electric current will be caused uncontrolled, threatens system safety.
The content of the invention
In view of this, the present invention proposes a kind of control method and on-off circuit of on-off circuit, by arranging synchronous opening
The connected mode of the body diode of pipe and the turning-on voltage of control synchro switch pipe are closed, can be solved above-mentioned of the prior art
The problem that on-off circuit is present.
According to the control method of the on-off circuit of the present invention, the on-off circuit includes inductance, power switch pipe and synchronization
Switching tube, the inductance connection is public with synchro switch pipe in the input voltage and the power switch pipe of the on-off circuit
Between junction point；
In the on-off circuit startup stage, when output voltage is less than input voltage, then by the synchro switch pipe
Body diode is hanging or direction of the body diode that control the synchro switch pipe is power switch described from outfan sensing
The points of common connection of pipe and synchro switch pipe, the control end of the power switch pipe receives pwm control signal, the synchro switch
The control end of pipe receives the input voltage signal；
When output voltage is equal to more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction of the body diode of the synchro switch pipe is to point to from the points of common connection of the power switch pipe and synchro switch pipe
The control end of outfan, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
According to the control method of the on-off circuit of the present invention, the on-off circuit includes inductance, power switch pipe and synchronization
Switching tube, the inductance connection is public with synchro switch pipe in the input voltage and the power switch pipe of the on-off circuit
Between junction point, in the on-off circuit course of normal operation,
Controlled output voltage is such as needed less than input voltage, then control the synchro switch pipe body diode is hanging or control
The direction for making the body diode of the synchro switch pipe is the public affairs that the power switch pipe and synchro switch pipe are pointed to from outfan
Common junction point, the control end of the power switch pipe receives pwm control signal, and the control end of the synchro switch pipe receives described
Input voltage signal；
When such as needing controlled output voltage to be equal to more than input voltage, then by the body diode of the synchro switch pipe it is hanging or
The direction for being the body diode for controlling the synchro switch pipe is from the commonly connected of the power switch pipe and synchro switch pipe
The control end of point sensing outfan, the control end of the power switch pipe and the synchro switch pipe receives the PWM controls
Signal.
According to the control method of the on-off circuit of the present invention, the on-off circuit includes inductance, power switch pipe and synchronization
Switching tube, the inductance connection is public with synchro switch pipe in the input voltage and the power switch pipe of the on-off circuit
Between junction point, when the on-off circuit quits work,
Control the control end ground connection of the power switch pipe；
As now output voltage is more than input voltage, then the control end for controlling the synchro switch pipe receives output voltage letter
Number, and control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe is
Outfan is pointed to from the points of common connection of the power switch pipe and synchro switch pipe,
As now output voltage is less than input voltage, then the control end receives input voltage letter of the synchro switch pipe is controlled
Number, and control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe is
The points of common connection of the power switch pipe and synchro switch pipe is pointed to from outfan.
The on-off circuit of the foundation present invention, including inductance, power switch pipe and synchro switch pipe, the inductance connection is in institute
State between the input voltage of on-off circuit and the points of common connection of the power switch pipe and synchro switch pipe,
The body diode of the synchro switch pipe includes the first diode and the second diode, the first diode and the two or two
The negative electrode connection of pole pipe, the anode of first diode connects the outfan, the anode connection institute of second diode
The points of common connection of power switch pipe and synchro switch pipe is stated,
In the on-off circuit startup stage, when output voltage is less than input voltage, then by the synchro switch pipe
Body diode is hanging or direction of the body diode that control the synchro switch pipe is power switch described from outfan sensing
The points of common connection of pipe and synchro switch pipe, the control end of the power switch pipe receives pwm control signal, the synchro switch
The control end of pipe receives the input voltage signal；
When output voltage is equal to more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction of the body diode of the synchro switch pipe is to point to from the points of common connection of the power switch pipe and synchro switch pipe
The control end of outfan, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
Further, in the on-off circuit course of normal operation,
Controlled output voltage is such as needed less than input voltage, then control the synchro switch pipe body diode is hanging or control
The direction for making the body diode of the synchro switch pipe is the public affairs that the power switch pipe and synchro switch pipe are pointed to from outfan
Common junction point, the control end of the power switch pipe receives pwm control signal, and the control end of the synchro switch pipe receives described
Input voltage signal；
When such as needing controlled output voltage to be equal to more than input voltage, then by the body diode of the synchro switch pipe it is hanging or
The direction for being the body diode for controlling the synchro switch pipe is from the commonly connected of the power switch pipe and synchro switch pipe
The control end of point sensing outfan, the control end of the power switch pipe and the synchro switch pipe receives the PWM controls
Signal.
Further, when the on-off circuit quits work,
Control the control end ground connection of the power switch pipe；
If output voltage is more than input voltage, the control end for controlling the synchro switch pipe receives output voltage signal,
And control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe be from
The points of common connection of the power switch pipe and synchro switch pipe points to outfan,
If output voltage is less than input voltage, the control end receives input voltage signal of the synchro switch pipe is controlled,
And control that the substrate of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe is from output
Point to the points of common connection of the power switch pipe and synchro switch pipe in end.
Further, the on-off circuit further includes first switch pipe, and the first switch pipe is connected in parallel on described
The two ends of one diode.
Further, the on-off circuit further includes second switch pipe, and the second switch pipe is connected in parallel on described
The two ends of two diodes.
Further, the on-off circuit further includes the 3rd switching tube and the 4th switching tube, the 3rd switching tube
The two ends of first diode are connected in parallel on, the 4th paralleled power switches are at the two ends of second diode.
In sum, according to the control method and on-off circuit of a kind of on-off circuit of the invention, by arranging synchronous opening
The connected mode of the body diode of pipe is closed, so as to change the sensing of the body diode of synchro switch pipe, then by controlling power
The grid voltage of switching tube and synchro switch pipe, it is possible to achieve：One is on-off circuit in the course of work is started, output voltage by
Zero begins to ramp up, and without inrush current, can avoid damaging device in circuit；Two is the normal work mistake in on-off circuit
Cheng Zhong, can be higher than input voltage with controlled output voltage, it is also possible to which controlled output voltage is less than input voltage；Three are closed in circuit
Under machine state, input is blocked completely with outfan, even if circuit malfunctions, it is also possible to effective protection circuit, improves circuit
Efficiency and reliability.
Figure explanation
Fig. 1 show the schematic diagram of the on-off circuit of synchronous rectification of the prior art；
Fig. 2 a show on-off circuit the first implementation of reduction dash current of the prior art；
Fig. 2 b show second implementation of on-off circuit of reduction dash current of the prior art；
Fig. 2 c show on-off circuit the third implementation of reduction dash current of the prior art；
Fig. 3 a show the on-off circuit of input and output of the prior art blocking the first implementation；
Fig. 3 b show second implementation of on-off circuit of input and output blocking of the prior art；
Fig. 4 a show the first implementation of the on-off circuit according to the present invention；
Fig. 4 b show second implementation of the on-off circuit according to the present invention；
Fig. 4 c show the third implementation of the on-off circuit according to the present invention；
Fig. 4 d show the 4th kind of implementation of the on-off circuit according to the present invention；
Fig. 5 a show the first circuit controling drawing in the on-off circuit course of work according to the present invention；
Fig. 5 b show second circuit controling drawing in the on-off circuit course of work according to the present invention；
Fig. 6 show the shutdown fundamental diagram of the on-off circuit according to the present invention；
Fig. 7 a show the flow chart of the control method of the start-up course of the on-off circuit according to the present invention；
Fig. 7 b show the flow chart of the control method of the shutdown process of the on-off circuit according to the present invention.
Specific embodiment
Some currently preferred embodiments of the present invention is described in detail below with reference to accompanying drawing, but the invention is not restricted to this.
Just as known from prior art, due to there is inrush current in traditional booster circuit, in order to reduce
Inrush current causes to damage to component, there is following several solutions in prior art：
1)：Connect bypass diode D1 in the input VIN and outfan VOUT of booster circuit, as shown in Figure 2 a, input
On voltage VIN during electricity, dash current major part can be charged by bypass diode D1 to output capacitance C2, so as to reduce to master
The damage of components and parts in circuit.
2)：The system start-up period increase current-limiting resistance, as shown in Figure 2 b, current-limiting resistance R1 be connected on input VIN and
Between inductance L, delay switch MDELAYIt is in parallel with current-limiting resistance R1.Electric moment, delay switch M in input voltage VINDELAYIt is in
Off state, current-limiting resistance R1 is connected on main loop of power circuit, and input voltage VIN is filled by current-limiting resistance R1 to output capacitance C2
Electricity.After time delay for a period of time, delay switch M is controlledDELAYConducting, current-limiting resistance R1 is shorted and is no longer worked, reduced with this
Damage to components and parts in main circuit.
3)：Increase Current limited Control loop, as shown in Figure 2 c, in system start-up phase, electric current is detected with voltage detection unit
The pressure drop of synchronous rectifier M2 and electric current, by loop the mesh that power switch pipe M1 grid voltages reach control M1 electric currents is controlled
's.When power switch pipe M1 pressure drops are larger, output capacitance C2 is charged with less constant current；With on output voltage
Rise, power switch pipe M1 pressure drops drop to after certain threshold value, larger output current are switched to, until output voltage VO UT exceedes
Input voltage VIN, then switch to normal boost operating mode.
But, the equal Shortcomings part of three kinds of above-mentioned modes：Increase between booster circuit input and outfan other
The mode of road diode can not reduce inrush current, simply allow bypass diode to shunt most of dash current, therefore
Need to select rated current than larger diode, which results in the increase of system cost.By increasing current-limiting resistance and prolonging
The mode of Shi Kaiguan similarly has that system cost increases, and after start-up course terminates, delay switch is gone here and there always
Main loop of power circuit is associated in, this will cause the loss in efficiency of system.Increasing the scheme of current-limiting control circuit can solve to start punching
Hit problem, however it is necessary that increase feedback control loop, system complex, and export can only band compared with light-load starting.
Block completely with input to realize exporting to solve traditional booster circuit, prior art is generally using following
Several measures：
1) a switching tube M is concatenated in input VIN or outfan VOUTSCP, the breaker in middle pipe as shown in Fig. 3 a or 3b
MSCPIt is shown, quit work switching tube M then when control booster circuit is neededSCPShut-off, due to MSCPBody diode and booster circuit
The body diode of synchro switch pipe is in opposite direction, therefore can realize that circuit input is complete switched off with output；
2) in circuit input or outfan concatenation resettable fuse F1, when system jam makes to flow through self- recoverage guarantor
Dangerous silk electric current increase heating cuts off electric fuse, plays a protective role, as shown in Fig. 3 a or 3b shown in middle F1；
But, such scheme there is also deficiency：Due to needing to increase extra switching tube or resettable fuse, system
It is relatively costly；Or because switching tube or resettable fuse need to be connected on main work(always under normal circuit operation state
Rate loop, result in the less efficient of system；Additionally, due to resettable fuse be by heat effect principle come protection circuit, because
This protects speed slow and is not easily achieved and accurately controls, and reduces the reliability of system.
Therefore, inventor is on the basis of the studies above, it is proposed that a kind of on-off circuit, such as Fig. 4 a, Fig. 4 b, Fig. 4 c and figure
4d show a kind of circuit diagram of the first embodiment of the on-off circuit according to the present invention, such as Fig. 4 a, Fig. 4 b, Fig. 4 c and Fig. 4 d institutes
Show, the on-off circuit includes inductance L1, power switch pipe M1 (by taking nmos switch pipe as an example) and synchro switch pipe M2 (with PMOS
As a example by switching tube), the inductance L1 is connected to the positive pole and the power switch of the DC input voitage VIN of the on-off circuit
Another termination input voltage VIN of the points of common connection SW of pipe M1 and synchro switch pipe M2, the power switch pipe M1
Negative pole, the positive pole of output voltage VO UT of another termination on-off circuit of the synchro switch pipe, the output voltage
The minus earth of VOUT.Input capacitance CIN is connected in parallel on the two ends of the DC input voitage, and output capacitance COUT is connected in parallel on described
The two ends of output voltage.
As is shown in fig. 4 a, the body diode of the synchro switch pipe includes the first diode D1 and the second diode D2,
The negative electrode connection of the first diode D1 and the second diode D2, the anode of the first diode D1 connects the outfan, institute
The anode for stating the second diode D2 connects the points of common connection SW of the power switch pipe and synchro switch pipe.The synchro switch
The body diode junction point of pipe is designated as B poles, and in the present embodiment, the B of the substrate of the synchro switch pipe is extremely hanging.
According to the circuit structure of Fig. 4 a, when the on-off circuit starts, output voltage VO UT is zero, output voltage VO UT
Less than input voltage VIN, now can be extremely hanging by the body diode B of the synchro switch pipe, synchro switch pipe M2 control ends
I.e. grid G is connected to DC input voitage VIN, and the control end of power switch pipe M1 is that grid receives pwm control signal, such as Fig. 5 a institutes
The grid connected mode of power switch pipe and synchro switch pipe shown in showing.The gate source voltage of power switch pipe M1 is led more than it
Be powered pressure, and when power switch pipe M1 is turned on, the voltage of points of common connection SW is pulled down to zero.Now, it is clear that output voltage VO UT
Less than DC input voitage VIN, synchro switch pipe M2 grids current potential highest for source electrode and drain electrode, therefore, synchronously open
Pipe M2 shut-offs are closed, inductance L1 electric currents rise, power switch pipe M1 turns on certain hour or when inductive current rises to setting base
On time, power switch pipe M1 shut-offs；When power switch pipe M1 is turned off, because inductive current direction is from input to commonly connected
Point SW, therefore the voltage rising of points of common connection SW, when points of common connection SW voltages rise to the grid source for making synchro switch pipe M2
Voltage VGSLess than its cut-in voltage VTHWhen, i.e. VGS<VTH, wherein VTHFor the cut-in voltage of synchro switch pipe M2, synchro switch pipe
M2 is turned on, it is readily appreciated that, because synchro switch pipe M2 is PMOS switch pipe, so voltage VGSWith voltage VTHNegative voltage is, so
Afterwards output voltage VO UT begins to ramp up, in order to maintain synchro switch pipe M2 conducting states, points of common connection SW voltages at least should
Cut-in voltage V is higher by than DC input voitage VIN voltageTHSize.And now because output voltage VO UT is still less than input
Voltage VIN, it can therefore be appreciated that synchro switch pipe M2 is operated in saturation, synchro switch pipe M2 pressure drops are about VIN+VTH+
VDSAT-VOUT, wherein, VDSAT is the saturation voltage of synchro switch pipe M2, and inductive current declines, sets when inductive current drops to
When determining reference value, then the M1 conductings of control power switch pipe repeat again said process.
Afterwards, when output voltage VO UT is risen to equal to or more than input voltage, the body diode of synchro switch pipe M2
B it is extremely hanging, the control end of power switch pipe M1 and synchro switch pipe M2 receives the pwm control signal, power switch pipe
With the grid connected mode of synchro switch pipe as shown in Figure 5 b.Power switch pipe M1 and synchro switch pipe M2 replaces break-make, circuit
Into conventional boost operating mode.
By above-mentioned startup mode of operation it is recognised that the on-off circuit of the present invention can make on startup output voltage
VOUT starts from scratch rising, and the electric current in start-up course is controlled, and to circuit impact will not be produced, and will not damage circuit
In components and parts.According to above-mentioned circuit structure, the embodiment of the present invention increases feedback by the way of PWM controls without the need for extra
Loop, implement it is simple and reliable, and be capable of achieving outfan can be with starting with full load.
With reference to the circuit diagram of the second embodiment that Fig. 4 b are a kind of on-off circuit according to the present invention, the present embodiment is in figure
First switch pipe S1 is increased in the embodiment of 4a, the first switch pipe S1 is connected in parallel on the two ends of the first diode D1.
In the same manner, during circuit start, output voltage VO UT is less than input voltage VIN, now controls first switch pipe S1 and disconnects；
When output voltage VO UT is more than input voltage VIN, continue to control first switch pipe S1 disconnections, the work(of embodiment shown in Fig. 4 b
It is identical in the connected mode of the control end of rate switching tube and synchro switch pipe and Fig. 4 a, in start-up course, this reality
The course of work and Fig. 4 a for applying example is also identical, be will not be described here.For Fig. 4 a, the two of the first diode D1
End first switch pipe in parallel, can improve system effectiveness, reduce the probability that latch-up occurs.
With reference to the circuit diagram of the 3rd embodiment that Fig. 4 c are a kind of on-off circuit according to the present invention, the present embodiment is in figure
Second switch pipe S2 is increased in the embodiment of 4a, the second switch pipe S2 is connected in parallel on the two ends of the second diode D2.
In the same manner, during circuit start, output voltage VO UT is less than input voltage VIN, now controls second switch pipe S2 closures；
When output voltage VO UT is more than input voltage VIN, control second switch pipe S2 disconnects, and the power of embodiment is opened shown in Fig. 4 c
It is identical to close in the connected mode and Fig. 4 a of the control end of pipe and synchro switch pipe, in start-up course, the present embodiment
The course of work and Fig. 4 a be also identical, will not be described here.
Fig. 4 d are a kind of circuit diagram of the fourth embodiment of the on-off circuit according to the present invention, and the present embodiment is in Fig. 4 a
The 3rd switching tube S3 and the 4th switching tube S4 is increased in embodiment, the 3rd switching tube S3 is connected in parallel on first diode
The two ends of D1, the 4th switching tube S4 is connected in parallel on the two ends of the second diode D2.In the same manner, in circuit start process
In, output voltage VO UT is less than input voltage VIN, now controls the 3rd switching tube S3 and disconnects, control the 4th switching tube S4 closures；
When output voltage VO UT is more than input voltage VIN, control the 3rd switching tube S3 closures, the 4th switching tube S4 of control disconnects, figure
It is identical in the connected mode of the power switch pipe of embodiment shown in 4d and the control end of synchro switch pipe and Fig. 4 a,
In start-up course, the course of work and Fig. 4 a of the present embodiment are also identical, be will not be described here.
Fig. 5 a show control of output voltage VO UT less than power switch pipe M1 and synchro switch pipe M2 during input voltage VIN
The control mode of the connected mode at end processed and the body diode of synchro switch pipe M2, where the dotted line signifies that output voltage VO UT<
Synchro switch pipe M2 body diodes switching tube in parallel is optional during input voltage VIN；Fig. 5 b show output voltage VO UT
More than power switch pipe M1 during input voltage VIN and the connected mode and synchro switch pipe M2 of the control end of synchro switch pipe M2
Body diode control mode, dotted line represents the synchro switch pipe M2 bodies in the case of output voltage VO UT >=input voltage VIN
The switching tube of diodes in parallel is optional.Can be seen that when output voltage is less than input electricity according to the embodiment of Fig. 5 a and 5b
During pressure, the direction of the body diode of the synchro switch pipe is to point to the power switch pipe and synchro switch pipe from outfan
Points of common connection；When output voltage is equal to more than input voltage, the direction of the body diode of the synchro switch pipe is from institute
The points of common connection for stating power switch pipe and synchro switch pipe points to outfan.By the embodiment of the present invention to synchro switch pipe
Body diode sensing control, it is possible to achieve on-off circuit can make on startup output voltage VO UT start from scratch rising,
And the electric current in start-up course is controlled, and to circuit impact will not be produced, the components and parts that will not be damaged in circuit.
The above-mentioned course of work according to the on-off circuit of the present invention in start-up course, in the course of normal operation of circuit
In, such as need controlled output voltage VOUT to be higher than input voltage VIN, then circuit is operated in traditional boost mode, as shown in Figure 5 b,
Such as need controlled output voltage VOUT less than input voltage VIN, then circuit operating pattern is similar to Fig. 5 a.Therefore the switch of the present invention
Circuit can both make circuit be operated in state of the output voltage higher than input voltage, it is also possible to make circuit be operated in output voltage low
In the state of input voltage.
Finally, when on-off circuit needs to enter and quits work state, then the control end of power switch pipe M1 is controlled first
That is grounded-grid, then, when shutdown moment output voltage VO UT is higher than input voltage VIN, then first by the grid of synchro switch pipe M2
Pole is grounded, and inductive current is declined by synchro switch pipe M2 afterflows, inductive current, after inductive current drops to zero, now, such as
Fruit output voltage VO UT>DC input voitage VIN, then be connected to output voltage VO UT by the grid of synchro switch pipe M2, synchronously opens
The connected mode for closing pipe M2 body diode B poles is similar to Fig. 5 b；When inductive current drops to zero, if output voltage VO UT<
DC input voitage VIN, then be connected to input voltage VIN, synchro switch pipe M2 body diode B poles by the grid of synchro switch pipe M2
Connection is similar to Fig. 5 a.
If at the shutdown moment, output voltage VO UT of on-off circuit is less than input voltage VIN, then by synchro switch pipe M2
Grid meet DC input voitage VIN, synchro switch pipe M2 is operated in saturation, after inductive current drops to zero, synchronously opens
Close pipe M2 shut-offs.
The shutdown operation principle of on-off circuit is as shown in fig. 6, wherein dotted portion represents above-mentioned output voltage VO UT<Input
The switch of the synchro switch pipe M2 body diodes parallel connection in the case of two kinds of voltage VIN and output voltage VO UT >=input voltage VIN
Pipe is optional, and MAX represents that selection inductive current is selected between output voltage VO UT and DC input voitage VIN after dropping to zero
Higher value as synchro switch pipe M2 signal.From above-mentioned shutdown control circuit process description, if the shutdown moment
Inductive current direction from input to points of common connection SW, then inductive current will be by synchro switch pipe M2 to output voltage
VOUT afterflows, when inductive current drops to zero, synchro switch pipe M2 is complete switched off, and main circuit quits work；If shutdown moment electricity
Inducing current direction is continued by points of common connection SW to input, then inductive current by the body diode of power switch pipe M1
Stream, makes inductive current drop to zero, and main circuit quits work.Therefore according to the control method and switch electricity of on-off circuit of the present invention
Road can make system in shutdown process, and inductive current has all the time continuous current circuit, and will not produce due to voltage spikes, and main circuit stops
After only working, its input is blocked completely with outfan.Even if generation fault, such as output short-circuit or overload, due to circuit
Input is blocked completely with output, therefore system can obtain timely and effective protection, good reliability.
With reference to the control method of the start-up course that Fig. 7 a are the on-off circuit according to the present invention, including step：Open described
Powered-down road startup stage, when output voltage is less than input voltage, then by the body diode of the synchro switch pipe it is hanging or
The direction for controlling the body diode of the synchro switch pipe is to point to the power switch pipe and synchro switch pipe from outfan
Points of common connection, the control end of the power switch pipe receives pwm control signal, and the control end of the synchro switch pipe receives institute
State input voltage signal；
When output voltage is equal to more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction of the body diode of the synchro switch pipe is to point to from the points of common connection of the power switch pipe and synchro switch pipe
The control end of outfan, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
With reference to the control method of the shutdown process that Fig. 7 b are the on-off circuit according to the present invention, including step：Open when described
When powered-down road quits work,
Control the control end ground connection of the power switch pipe；
As now output voltage is more than input voltage, then the control end for controlling the synchro switch pipe receives output voltage letter
Number, and control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe is
Outfan is pointed to from the points of common connection of the power switch pipe and synchro switch pipe,
As now output voltage is less than input voltage, then the control end receives input voltage letter of the synchro switch pipe is controlled
Number, and control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe is
The points of common connection of the power switch pipe and synchro switch pipe is pointed to from outfan.
The control method and on-off circuit of the on-off circuit according to the preferred embodiments of the present invention are carried out above detailed
Describe, but the circuit and beneficial effect with regard to the patent should not be considered as being limited only to described above, disclosed enforcement
Example and accompanying drawing can be better understood from the present invention, therefore, embodiment and Figure of description content disclosed above is in order to more preferable
The understanding present invention, present invention protection is not limited to limit the scope of the present disclosure, and those of ordinary skill in the art are to of the invention real
Apply the replacement of example, change within protection scope of the present invention.
Claims (9)
1. a kind of control method of on-off circuit, the on-off circuit includes inductance, power switch pipe and synchro switch pipe, described
Inductance connection between the input voltage of the on-off circuit and the points of common connection of the power switch pipe and synchro switch pipe,
Characterized in that,
In the on-off circuit startup stage, when output voltage is less than input voltage, then by the body two of the synchro switch pipe
Pole pipe is hanging or direction of the body diode that control the synchro switch pipe be from outfan point to the power switch pipe with
The points of common connection of synchro switch pipe, the control end of the power switch pipe receives pwm control signal, the synchro switch pipe
Control end receives the input voltage signal；
When output voltage is equal to more than input voltage, then by the body diode of the synchro switch pipe vacantly or described in control
The direction of the body diode of synchro switch pipe is to point to output from the points of common connection of the power switch pipe and synchro switch pipe
The control end of end, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
2. a kind of control method of on-off circuit, the on-off circuit includes inductance, power switch pipe and synchro switch pipe, described
Inductance connection between the input voltage of the on-off circuit and the points of common connection of the power switch pipe and synchro switch pipe,
Characterized in that, in the on-off circuit course of normal operation,
Controlled output voltage is such as needed less than input voltage, then control the synchro switch pipe body diode is hanging or control institute
The direction for stating the body diode of synchro switch pipe is the public company that the power switch pipe and synchro switch pipe are pointed to from outfan
Contact, the control end of the power switch pipe receives pwm control signal, and the control end of the synchro switch pipe receives the input
Voltage signal；
When such as needing controlled output voltage to be equal to more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction for making the body diode of the synchro switch pipe is to refer to from the points of common connection of the power switch pipe and synchro switch pipe
To outfan, the control end of the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
3. a kind of control method of on-off circuit, the on-off circuit includes inductance, power switch pipe and synchro switch pipe, described
Inductance connection between the input voltage of the on-off circuit and the points of common connection of the power switch pipe and synchro switch pipe,
Characterized in that, when the on-off circuit quits work,
Control the control end ground connection of the power switch pipe；
As now output voltage is more than input voltage, then the control end for controlling the synchro switch pipe receives output voltage signal,
And control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe be from
The points of common connection of the power switch pipe and synchro switch pipe points to outfan,
As now output voltage is less than input voltage, then the control end receives input voltage signal of the synchro switch pipe is controlled,
And control that the body diode of the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe be from
Outfan points to the points of common connection of the power switch pipe and synchro switch pipe.
4. a kind of on-off circuit, including inductance, power switch pipe and synchro switch pipe, the inductance connection is in the on-off circuit
Input voltage and the points of common connection of the power switch pipe and synchro switch pipe between, it is characterised in that
The body diode of the synchro switch pipe includes the first diode and the second diode, the first diode and the second diode
Negative electrode connection, the anode of first diode connects the outfan, and the anode of second diode connects the work(
The points of common connection of rate switching tube and synchro switch pipe,
In the on-off circuit startup stage, when output voltage is less than input voltage, then by the body two of the synchro switch pipe
Pole pipe is hanging or direction of the body diode that control the synchro switch pipe be from outfan point to the power switch pipe with
The points of common connection of synchro switch pipe, the control end of the power switch pipe receives pwm control signal, the synchro switch pipe
Control end receives the input voltage signal；
When output voltage is equal to more than input voltage, then by the body diode of the synchro switch pipe vacantly or described in control
The direction of the body diode of synchro switch pipe is to point to output from the points of common connection of the power switch pipe and synchro switch pipe
The control end of end, the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
5. on-off circuit according to claim 4, it is characterised in that in the on-off circuit course of normal operation,
Controlled output voltage is such as needed less than input voltage, then control the synchro switch pipe body diode is hanging or control institute
The direction for stating the body diode of synchro switch pipe is the public company that the power switch pipe and synchro switch pipe are pointed to from outfan
Contact, the control end of the power switch pipe receives pwm control signal, and the control end of the synchro switch pipe receives the input
Voltage signal；
When such as needing controlled output voltage to be equal to more than input voltage, then by the body diode of the synchro switch pipe is hanging or control
The direction for making the body diode of the synchro switch pipe is to refer to from the points of common connection of the power switch pipe and synchro switch pipe
To outfan, the control end of the control end of the power switch pipe and the synchro switch pipe receives the pwm control signal.
6. the on-off circuit according to claim 4 or 5, it is characterised in that when the on-off circuit quits work,
Control the control end ground connection of the power switch pipe；
If output voltage is more than input voltage, the control end for controlling the synchro switch pipe receives output voltage signal, and controls
Make the synchro switch pipe body diode is hanging or direction of the body diode that controls the synchro switch pipe is from described
The points of common connection of power switch pipe and synchro switch pipe points to outfan,
If output voltage is less than input voltage, the control end receives input voltage signal of the synchro switch pipe is controlled, and controlled
The substrate for making the synchro switch pipe is hanging or direction of the body diode that controls the synchro switch pipe is to refer to from outfan
To the power switch pipe and the points of common connection of synchro switch pipe.
7. the on-off circuit according to claim 4 or 5 or 6, it is characterised in that
The on-off circuit further includes first switch pipe, and the first switch pipe is connected in parallel on the two of first diode
End.
8. the on-off circuit according to claim 4 or 5 or 6, it is characterised in that
The on-off circuit further includes second switch pipe, and the second switch pipe is connected in parallel on the two of second diode
End.
9. the on-off circuit according to claim 4 or 5 or 6, it is characterised in that
The on-off circuit further includes the 3rd switching tube and the 4th switching tube, and the 3rd paralleled power switches are described first
The two ends of diode, the 4th paralleled power switches are at the two ends of second diode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185327.6A CN106685201B (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
| CN202310537749.9A CN116545257A (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611185327.6A CN106685201B (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310537749.9A Division CN116545257A (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106685201A true CN106685201A (en) | 2017-05-17 |
| CN106685201B CN106685201B (en) | 2024-08-30 |
Family
ID=58869911
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611185327.6A Active CN106685201B (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
| CN202310537749.9A Pending CN116545257A (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310537749.9A Pending CN116545257A (en) | 2016-12-20 | 2016-12-20 | Control method of switching circuit and switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN106685201B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183617A (en) * | 2018-02-06 | 2018-06-19 | 北京航天发射技术研究所 | A kind of synchronous rectification control method and control device |
| CN108512417A (en) * | 2018-03-15 | 2018-09-07 | 矽力杰半导体技术(杭州)有限公司 | A kind of control circuit and its control method applied to boost converter |
| CN112117920A (en) * | 2019-06-20 | 2020-12-22 | 台达电子工业股份有限公司 | Power supply device, control method thereof and power supply system |
| CN113890315A (en) * | 2020-07-03 | 2022-01-04 | 圣邦微电子（北京）股份有限公司 | Control circuit and control method of switching converter and switching converter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842957A (en) * | 2004-07-20 | 2006-10-04 | 株式会社理光 | Switching regulator, power supply circuit and secondary cell charging circuit including the same |
| US20100007999A1 (en) * | 2007-12-26 | 2010-01-14 | Rohm Co., Ltd. | Step-up switching regulator |
| CN101997305A (en) * | 2009-08-26 | 2011-03-30 | 安凯(广州)微电子技术有限公司 | Reverse voltage protection circuit and power tube device |
| CN102761258A (en) * | 2012-07-25 | 2012-10-31 | 圣邦微电子（北京）股份有限公司 | Boosted circuit and control method thereof |
| CN202737742U (en) * | 2012-07-25 | 2013-02-13 | 圣邦微电子（北京）股份有限公司 | DC-DC booster converter |
| CN103545896A (en) * | 2013-11-07 | 2014-01-29 | 成都芯源系统有限公司 | Bidirectional switch circuit, mobile power supply circuit and control method thereof |
| CN104467415A (en) * | 2014-11-25 | 2015-03-25 | 成都芯源系统有限公司 | Multi-mode switching circuit and control method thereof |
-
2016
- 2016-12-20 CN CN201611185327.6A patent/CN106685201B/en active Active
- 2016-12-20 CN CN202310537749.9A patent/CN116545257A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1842957A (en) * | 2004-07-20 | 2006-10-04 | 株式会社理光 | Switching regulator, power supply circuit and secondary cell charging circuit including the same |
| US20100007999A1 (en) * | 2007-12-26 | 2010-01-14 | Rohm Co., Ltd. | Step-up switching regulator |
| CN101997305A (en) * | 2009-08-26 | 2011-03-30 | 安凯(广州)微电子技术有限公司 | Reverse voltage protection circuit and power tube device |
| CN102761258A (en) * | 2012-07-25 | 2012-10-31 | 圣邦微电子（北京）股份有限公司 | Boosted circuit and control method thereof |
| CN202737742U (en) * | 2012-07-25 | 2013-02-13 | 圣邦微电子（北京）股份有限公司 | DC-DC booster converter |
| CN103545896A (en) * | 2013-11-07 | 2014-01-29 | 成都芯源系统有限公司 | Bidirectional switch circuit, mobile power supply circuit and control method thereof |
| CN104467415A (en) * | 2014-11-25 | 2015-03-25 | 成都芯源系统有限公司 | Multi-mode switching circuit and control method thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183617A (en) * | 2018-02-06 | 2018-06-19 | 北京航天发射技术研究所 | A kind of synchronous rectification control method and control device |
| CN108512417A (en) * | 2018-03-15 | 2018-09-07 | 矽力杰半导体技术(杭州)有限公司 | A kind of control circuit and its control method applied to boost converter |
| US11081953B2 (en) | 2018-03-15 | 2021-08-03 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control method and control circuit for a boost converter |
| US11575324B2 (en) | 2018-03-15 | 2023-02-07 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control method and control circuit for a boost converter |
| CN112117920A (en) * | 2019-06-20 | 2020-12-22 | 台达电子工业股份有限公司 | Power supply device, control method thereof and power supply system |
| US11101738B2 (en) | 2019-06-20 | 2021-08-24 | Delta Electronics, Inc. | Power converter and control method thereof and power supply system |
| CN112117920B (en) * | 2019-06-20 | 2022-02-22 | 台达电子工业股份有限公司 | Power supply device, control method thereof and power supply system |
| CN113890315A (en) * | 2020-07-03 | 2022-01-04 | 圣邦微电子（北京）股份有限公司 | Control circuit and control method of switching converter and switching converter |
| CN113890315B (en) * | 2020-07-03 | 2023-08-22 | 圣邦微电子（北京）股份有限公司 | Control circuit and control method of switching converter and switching converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116545257A (en) | 2023-08-04 |
| CN106685201B (en) | 2024-08-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106685201A (en) | Switch circuit control method and switch circuit | |
| CN110392975B (en) | Method and voltage multiplier for converting an input voltage and separating circuit | |
| CN102013802B (en) | BOOST circuit with short circuit protection function | |
| US9979286B2 (en) | Power converting device | |
| CN103501108B (en) | The protecting against shock protection circuit of HVDC supply line and its implementation | |
| CN107409448A (en) | Tangent brightness adjustment control and protection | |
| CN103872658B (en) | Multifunction self-resetting formula is crossed, under-voltage protector | |
| CN101499654A (en) | Instant voltage peak and instant voltage surge suppressor | |
| CN108880230B (en) | Power sources in parallel control module and parallel system based on Switching Power Supply chopping voltage | |
| CN106229952B (en) | Fuse assembling device and control method, dc circuit breaker and control method | |
| CN104767368B (en) | A kind of highly reliable three-level inverter circuit Current limited Control method | |
| CN206517295U (en) | A kind of on-off circuit | |
| CN105684313B (en) | Power supply circuit, system and the method for supplying power to of transcriber | |
| CN107968567A (en) | A kind of nmos switch tube drive circuit | |
| CN103457472A (en) | Switching power supply and lamp applying same | |
| CN213817234U (en) | Protection circuit for AC220V equipment connected to AC380V | |
| CN207264977U (en) | For turning off the circuit of inductive load | |
| CN105827105B (en) | A kind of circuit for realizing exchange input pressure limiting using on-off mode | |
| EP3107200B1 (en) | Inverter grid-connected system and method for implementing three-phase alternating current grid-connected transition | |
| CN109545621B (en) | Driving circuit applied to aerospace high-power contactor | |
| CN207869084U (en) | A kind of electromagnetic valve switch control device | |
| CN107408885A (en) | DC to DC converter | |
| CN104767187A (en) | High-voltage direct-current breaker based on Sepic converter topology and fault removal method thereof | |
| CN205880138U (en) | Thyristor latching current automatic checkout device | |
| CN105515476B (en) | The device and method for improving brush-less electrically exciting Shaft-Generator short circuit overload capacity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 215600 west side of Guotai North Road, Zhangjiagang Economic and Technological Development Zone, Suzhou City, Jiangsu Province Applicant after: JOULWATT TECHNOLOGY (HANGZHOU) CO.,LTD. Address before: 4th Floor, Building E, Science and Technology Entrepreneurship Park, No.1 Guotai North Road, Zhangjiagang City, Suzhou City, Jiangsu Province, 215600 Applicant before: JOULWATT TECHNOLOGY (HANGZHOU) CO.,LTD. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |