CN206602454U - Make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification - Google Patents
Make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification Download PDFInfo
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- CN206602454U CN206602454U CN201621447335.9U CN201621447335U CN206602454U CN 206602454 U CN206602454 U CN 206602454U CN 201621447335 U CN201621447335 U CN 201621447335U CN 206602454 U CN206602454 U CN 206602454U
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- synchronous rectification
- rectifying tube
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Abstract
The utility model, which is related to, a kind of makes the circuit of rectifying tube soft start in circuit of synchronous rectification, including the first controlled switch, the second controlled switch and the first control loop；Two switch terminals of first controlled switch and the second controlled switch are serially connected on the drive signal input circuit of two rectifying tubes in circuit of synchronous rectification respectively；The control end of first controlled switch and the second controlled switch is connected in parallel in the control signal output of first control loop；The input of first control loop inputs the drive signal of the rectifying tube of the circuit of synchronous rectification, the equivalent resistance between the switch terminals of first controlled switch is diminished with the increase of the time span of the drive signal presence of the circuit of synchronous rectification.The utility model further relates to the module and its power supply of a kind of use foregoing circuit.Implementation is of the present utility model to make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification, has the advantages that：It is relatively low using flexible, cost.
Description
Technical field
The utility model is related to field of power supplies, makes in circuit of synchronous rectification that rectifying tube is soft to be opened more specifically to one kind
Dynamic circuit, module and its power supply.
Background technology
In the prior art, DCDC power supplys or ACDC power supplys can all be related to the control of switching device, and these switching devices lead to
Often it is related to chopper and rectifier etc..In general, these controls or drive signal are produced simultaneously by an integrated circuit
It is output to the control end of related power device.Synchronous rectification is also such, in circuit of synchronous rectification, the driving of its rectifying tube
Signal is exported by PWM chip, and control rectifying tube switch realizes rectification.In the topology such as normal shock, half-bridge, full-bridge, using synchronous whole
During current circuit, synchronous rectifier opens dutycycle with primary switch pipe dutycycle into complementary relationship, i.e., when primary switching tube duty
When smaller, it is larger that secondary synchronization rectifying tube opens dutycycle, when primary switching tube dutycycle is close to 0, secondary synchronization rectification
Pipe opens dutycycle close to 100%.Therefore it is external compared with large capacitive load when exporting, or during external connection battery, if the start starting stage
When output has certain bias voltage, deploy because startup stage primary switch pipe dutycycle is slow by 0, then secondary synchronization
Rectifying tube close to 100% dutycycle slowly to diminish, then voltage (equivalent to one voltage that secondary commutation pipe is biased by output
Source), outputting inductance, synchronous rectifier one discharge loop of formation, because this stage of rectifying tube keeps larger duty conducting, rectification
Pipe flows through larger electric current, is easily caused homogeneous tube damage.It can thus be appreciated that conventional synchronization rectification circuit do not possess output voltage it is pre- partially
Put function.If to have prebias function in circuit of synchronous rectification use, synchronous rectifier must realize soft open (soft start).
In the prior art, realize that the soft start of synchronous rectifier typically uses what the PWM chip with soft start function was realized, it is this
The method material cost of realization is higher, using dumb.
Utility model content
The technical problems to be solved in the utility model is, for prior art above-mentioned cost it is higher, using dumb
Defect there is provided a kind of cost it is relatively low, using flexibly make the circuit of rectifying tube soft start in circuit of synchronous rectification, module and its
Power supply.
The utility model solves the technical scheme that its technical problem used：Construction one kind makes whole in circuit of synchronous rectification
The circuit of flow tube soft start, including the first controlled switch, the second controlled switch and the first control loop；First controlled switch
Include two switch terminals and a control end respectively with the second controlled switch；First controlled switch and the second controlled switch
Two switch terminals are serially connected on the drive signal input circuit of two rectifying tubes in circuit of synchronous rectification respectively；Described first by
The control end of control switch and the second controlled switch is connected in parallel in the control signal output of first control loop；It is described
The input of first control loop inputs the drive signal of the rectifying tube of the circuit of synchronous rectification, and in drive signal effect
Under, output a control signal to the control end of first controlled switch, make between the switch terminals of first controlled switch etc.
Effect resistance diminishes with the increase of the time span of the drive signal presence of the circuit of synchronous rectification.
Further, first control loop includes the first charging and discharging circuit, the 3rd controlled switch and the second charge and discharge
Electrical circuit；First charging and discharging circuit charges in the presence of the drive signal so that the 3rd controlled switch is by leading
It is logical to switch to close, and then second charging and discharging circuit is started to charge up so that its be output to first controlled switch and
Second controlled switch switchs to conducting by closing.
Further, the 3rd controlled switch include a control end and two switch terminals, its control end with it is described
First charging and discharging circuit is connected, and one in two switch terminals is connected with power output end, and another is connected by first resistor
It is connected to equipotential.
Further, first charging and discharging circuit includes the first electric capacity and second resistance；First electric capacity and
Two resistance are attempted by between the control end of the 3rd controlled switch and equipotential, the control end of the 3rd controlled switch and institute
State the drive signal output end electrical connection of rectifying tube.
Further, second charging and discharging circuit includes the second electric capacity and first resistor, and second electric capacity simultaneously connects
In two switch terminals of the 3rd controlled switch.
Further, described two rectifying tubes are driven by the drive signal of two separate port outputs respectively, two drives
Dynamic signal output part is connected to the input of the 3rd controlled switch by a diodes in parallel respectively.
Further, the anode of the diode is connected with the drive signal output end, and its negative electrode is connected to described
The input of 3rd controlled switch.
Further, first controlled switch, the second controlled switch and the 3rd controlled switch are P channel MOSs
Effect pipe.
The utility model further relate to it is a kind of make the module of rectifying tube soft start in circuit of synchronous rectification, including at least one letter
In two output ends that number input and being at least used for is concatenated on a rectifying tube drive signal input circuit, the module
Circuit is the circuit described in above-mentioned any one.
The utility model further relates to a kind of power supply, including circuit of synchronous rectification, in addition to is connected to the synchronous rectification electricity
It is on road, as described in above-mentioned any one make the circuit of rectifying tube soft start in circuit of synchronous rectification.
Implementation is of the present utility model to make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification, has
Following beneficial effect：Due to being constituted using resolution element, it is possible to and the control core without synchronous rectification soft start function
Piece coordinates, and then realizes the soft start of synchronous rectification, with relatively low material cost；Meanwhile, it can optionally choose whether to make
With the soft start function of synchronous rectification, it is not necessary to main control chip is adjusted or changed, thus its using flexibly, cost compared with
It is low.
Brief description of the drawings
Fig. 1 is that the utility model makes the circuit of rectifying tube soft start in circuit of synchronous rectification, module and its power supply embodiment
Electrical block diagram；
Fig. 2 is to make the circuit diagram of rectifying tube soft starting circuit in circuit of synchronous rectification in the embodiment.
Embodiment
The utility model embodiment is described further below in conjunction with accompanying drawing.
As shown in figure 1, in the circuit of the present utility model for making rectifying tube soft start in circuit of synchronous rectification, module and its electricity
In the embodiment of source, make rectifying tube soft start in circuit of synchronous rectification circuit include the first controlled switch, the second controlled switch and
First control loop；First controlled switch and the second controlled switch include two switch terminals and a control end respectively；Institute
Two switch terminals for stating the first controlled switch and the second controlled switch are serially connected in two rectifying tubes in circuit of synchronous rectification respectively
Drive signal input circuit on, i.e. two switch terminals of the first controlled switch are serially connected in the drive signal input of a rectifying tube
On loop, and two switch terminals of the second controlled switch are serially connected on the drive signal input circuit of another rectifying tube, on
A switch terminals for stating controlled switch are connected to the driving signal input of rectifying tube, and another switch terminals is connected to driving letter
Number output end (terminal of PWM driving chips) on；In other words, increase on the drive signal input circuit of each rectifying tube
One controlled switch, in the case where the drive signal that driving chip is exported is constant, can be transported to the driving letter of rectifying tube
Number size, be to be determined by the on off state of the controlled switch；In the case where the controlled switch disconnects, driving chip output
Drive signal can not reach above-mentioned rectifying tube, and in the case where above-mentioned controlled switch is connected, discounting for two switches
Equivalent resistance between end, the drive signal of driving chip output all will be transferred on rectifying tube；Therefore, increasing above-mentioned
After controlled switch, the drive signal on rectifying tube being transported to reforms into two switch terminals controllable, by the controlled switch
Between equivalent resistance determine；That is, controlling the state of the controlled switch, it becomes possible to which control is applied on rectifying tube
The size of drive signal.For the control of above-mentioned controlled switch, the control of first controlled switch and the second controlled switch
End processed is connected in parallel in the control signal output of first control loop；The input input of first control loop
The drive signal of the rectifying tube of the circuit of synchronous rectification, and under drive signal effect, output a control signal to described the
The control end of one controlled switch, makes the equivalent resistance between the switch terminals of first controlled switch with the circuit of synchronous rectification
Drive signal exist time span increase and diminish.That is, in the present embodiment, PWM driving chips are defeated first
Go out rectification drive signal, the drive signal is except being connected in the switch terminals of above-mentioned first controlled switch and the second controlled switch
Outside, on the input for being also connected to above-mentioned first control loop；During beginning (for example, when electric on circuit), due to above-mentioned driving letter
Number time occurred is short, so under the control of above-mentioned first control loop, above-mentioned first controlled switch and the second controlled switch
Two switch terminals between equivalent resistance greatly, above-mentioned drive signal can not be transferred on above-mentioned rectifying tube at once, with
The increase of above-mentioned drive signal time of occurrence, the control signal of above-mentioned first control loop output is gradually reduced, on being so that
The equivalent resistance stated between the switch terminals of the first controlled switch and the second controlled switch is gradually reduced, then above-mentioned PWM drivings core
Semaphore on the early above-mentioned rectifying tube of drive signal transmission of piece output gradually increases, and then above-mentioned rectifying tube gradually starts work
Make.When above-mentioned drive signal is deposited after a certain time, above-mentioned first controlled switch and the second controlled switch are in the above-mentioned first control
In the presence of loop, into fully on state, the drive signal that then PWM driving chips are exported can be just completely transmitted to
State on rectifying tube.It is noted that for the first control loop, when drive signal has certain time (when starting shooting
Between reach certain time) after, above-mentioned first control loop also enter stable state, its state be not in change, cause above-mentioned
First controlled switch and the second controlled switch are also not in change, and then the rectification drive signal of PWM driving chips output leads to
Cross fully on above-mentioned first controlled switch and the second controlled switch is fully applied on above-mentioned rectifying tube.Now, the circuit
Any influence will not be carried out on normal commutating zone.
In the present embodiment, above-mentioned first control loop is filled including the first charging and discharging circuit, the 3rd controlled switch and second
Discharge loop (refers to the structure in the dotted line frame in Fig. 1)；First charging and discharging circuit is in above-mentioned rectification drive signal
Effect is lower to charge so that the 3rd controlled switch switchs to close by turning on, and then second charging and discharging circuit is started
Charging so that it is output to first controlled switch and the second controlled switch and switchs to conducting by closing.In other words, when above-mentioned
After rectification drive signal occurs, because the signal is typically the pulse signal with certain dutycycle, so the signal is applied to
After above-mentioned first charging and discharging circuit, start to charge to the loop；And the 3rd controlled switch includes a control end and two
Switch terminals, its control end is connected with first charging and discharging circuit, and one in two switch terminals is connected with power output end,
Another is connected to equipotential by first resistor.When the first charging and discharging circuit is started to charge up, above-mentioned 3rd controlled switch is
Conducting, then, supply voltage is applied directly in above-mentioned first resistor (i.e. R2 in Fig. 2), and the first resistor is not with waiting electricity
The voltage of one end of position connection is supply voltage, meanwhile, the voltage on the end is connected to above-mentioned first controlled switch and second
In the control end of controlled switch so that above-mentioned first controlled switch and the second controlled switch are off.In the present embodiment
In, Fig. 2 is referred to, first charging and discharging circuit includes the first electric capacity (C1) and second resistance (R1)；First electric capacity and
Second resistance is attempted by between the control end of the 3rd controlled switch and equipotential, the control end of the 3rd controlled switch with
The drive signal output end electrical connection of the rectifying tube.Then, when rectification drive signal occurs, because it is pulse signal, institute
Start to charge to the first electric capacity with the drive signal, charge accumulated on the first electric capacity to a certain extent before, the 3rd is controlled
Low potential is occurred that in the control end of switch, in being so that the 3rd controlled switch turns in the presence of supply voltage, it two
Individual switch terminals are equivalent to short circuit, and supply voltage is applied directly to one end of above-mentioned first resistor, and other the one of the first resistor
End be exactly equipotential ().Because second charging and discharging circuit includes the second electric capacity (C2) and first resistor (R2), described the
Two electric capacity are attempted by two switch terminals of the 3rd controlled switch.So, in two switches of above-mentioned 3rd controlled switch
In the case that end is equivalent to short circuit, electric current is not had on above-mentioned second electric capacity and is flowed through.Namely now the second charging and discharging circuit is simultaneously
Do not charge.And after the first charge circuit charges a period of time, the control end of above-mentioned 3rd controlled switch is changed into high level, the
Three controlled switch end or disconnected, and then, supply voltage is started to charge up by above-mentioned second electric capacity and first resistor, and above-mentioned first
One terminal voltage of resistance declines so that above-mentioned first controlled switch and the second controlled switch are begun to turn on.In the present embodiment, institute
It is P-channel metal-oxide-semiconductor field effect transistor to state the first controlled switch, the second controlled switch and the 3rd controlled switch.
In addition, in the present embodiment, referring to Fig. 2, (PWM drives above-mentioned two rectifying tube by two separate ports respectively
The signal output part of chip) output drive signal driving, two drive signal output ends respectively by a diode (D1,
D2) it is parallel-connected to the input of the 3rd controlled switch.The anode of the diode is exported with the drive signal respectively
End connection, its negative electrode is connected to the input of the 3rd controlled switch.
So, in the present embodiment, the circuit shown in Fig. 2 can solve circuit of synchronous rectification in the case of pre-bias voltage
Synchronous rectification soft start problem, it is to avoid synchronous rectifier is damaged.And it should be made up of less discrete device, and be applicable BUCK, just
The topologys such as sharp, half-bridge, full-bridge.
In fig. 2, by p-type metal-oxide-semiconductor Q3, Q4, Q5, diode D1, D2, electric capacity C1, C2, resistance R1, R2 composition are above-mentioned to be made
The circuit of rectifying tube soft start in circuit of synchronous rectification.The workflow of whole circuit is as follows：Upon power-up, because C1 is initially electric
Press as 0, as long as supply voltage VCC has enough voltage, Q5 conductings, C2 two ends are equivalent to short-circuit condition, Q3, Q4 G pole tensions
No matter VCC voltages, then now drive IC VOA or VOB to export high and low level, and Q3, Q4 are cut-off state, and rectifying tube can only pass through
Its body diode is turned on.After start, PWM drivings IC drive signal charges for C1, the Q5 when C1 both end voltages reach certain value
Close, C2 and R2 one charge circuit of formation is charged, then Q3, Q4 slow step-down of G pole tensions by VCC, certain journey is arrived when low
Q3, Q4 are begun to turn on during degree (its G, S voltage, which reaches, opens threshold voltage), because this stage Q3, Q4 Rds relatively dies exist
Rectifying tube driving voltage is relatively low in one switch periods, with Q3, and Q4 Rds slowly diminishes, and rectifying tube driving voltage slowly rises
Height, then can realize the process that synchronous rectifier Rds slowly diminishes, so that reaching prevents that the energy of output end prebias is rapid to whole
Flow tube instead fills the possibility for causing it to damage.
In the present embodiment, further relate to a kind of make the module of rectifying tube soft start in circuit of synchronous rectification, including at least one
Individual signal input part and at least it is used for two output ends being concatenated on a rectifying tube drive signal input circuit, the module
Interior circuit makes the circuit of rectifying tube soft start in circuit of synchronous rectification for above-mentioned.
In the present embodiment, a kind of power supply, including circuit of synchronous rectification are further related to, in addition to is connected to the synchronous rectification
It is on circuit, make the circuit of rectifying tube soft start in circuit of synchronous rectification described above.
Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed,
But therefore it can not be interpreted as the limitation to the utility model the scope of the claims.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that including the first controlled switch, second
Controlled switch and the first control loop；First controlled switch and the second controlled switch include two switch terminals and one respectively
Control end；Two switch terminals of first controlled switch and the second controlled switch are serially connected in two in circuit of synchronous rectification respectively
On the drive signal input circuit of individual rectifying tube；The control end of first controlled switch and the second controlled switch is connected in parallel
In the control signal output of first control loop；The input of first control loop inputs the synchronous rectification electricity
The drive signal of the rectifying tube on road, and under drive signal effect, output a control signal to the control of first controlled switch
End processed, makes the equivalent resistance between the switch terminals of first controlled switch exist with the drive signal of the circuit of synchronous rectification
Time span increase and diminish.
2. according to claim 1 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described
One control loop includes the first charging and discharging circuit, the 3rd controlled switch and the second charging and discharging circuit；First charging and discharging circuit
Charged in the presence of the drive signal so that the 3rd controlled switch switchs to close by turning on, and then causes described the
Two charging and discharging circuits are started to charge up so that it is output to first controlled switch and the second controlled switch switchs to lead by closing
It is logical.
3. according to claim 2 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described
Three controlled switch include a control end and two switch terminals, and its control end is connected with first charging and discharging circuit, two
One in switch terminals is connected with power output end, and another is connected to equipotential by first resistor.
4. according to claim 3 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described
One charging and discharging circuit includes the first electric capacity and second resistance；First electric capacity and second resistance are attempted by the described 3rd and controlled opened
Between the control end and equipotential of pass, the control end of the 3rd controlled switch and the drive signal output end electricity of the rectifying tube
Connection.
5. according to claim 4 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described
Two charging and discharging circuits include the second electric capacity and first resistor, and second electric capacity be attempted by the 3rd controlled switch two open
On Guan Duan.
6. according to claim 5 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described two
Individual rectifying tube is driven by the drive signal of two separate port outputs respectively, and two drive signal output ends pass through one two respectively
Pole pipe is parallel-connected to the input of the 3rd controlled switch.
7. according to claim 6 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described two
The anode of pole pipe is connected with the drive signal output end, and its negative electrode is connected to the input of the 3rd controlled switch.
8. according to claim 7 make the circuit of rectifying tube soft start in circuit of synchronous rectification, it is characterised in that described
One controlled switch, the second controlled switch and the 3rd controlled switch are P-channel metal-oxide-semiconductor field effect transistor.
Make the module of rectifying tube soft start in circuit of synchronous rectification 9. a kind of, including at least one signal input part and be at least used for
Two output ends concatenated on a rectifying tube drive signal input circuit, it is characterised in that the circuit in the module is
Circuit described in claim 1-8 any one.
10. a kind of power supply, including circuit of synchronous rectification, it is characterised in that also including be connected to it is on the circuit of synchronous rectification,
Make the circuit of rectifying tube soft start in circuit of synchronous rectification as described in claim 1-8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621447335.9U CN206602454U (en) | 2016-12-27 | 2016-12-27 | Make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621447335.9U CN206602454U (en) | 2016-12-27 | 2016-12-27 | Make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206602454U true CN206602454U (en) | 2017-10-31 |
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ID=60149813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621447335.9U Active CN206602454U (en) | 2016-12-27 | 2016-12-27 | Make the circuit of rectifying tube soft start, module and its power supply in circuit of synchronous rectification |
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| Country | Link |
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| CN (1) | CN206602454U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555631A (en) * | 2020-05-22 | 2020-08-18 | 北京新雷能科技股份有限公司 | DC/DC converter and pre-bias control method and device thereof |
| CN112769323A (en) * | 2020-12-30 | 2021-05-07 | 深圳市皓文电子有限公司 | Method for realizing synchronous rectification soft start |
-
2016
- 2016-12-27 CN CN201621447335.9U patent/CN206602454U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555631A (en) * | 2020-05-22 | 2020-08-18 | 北京新雷能科技股份有限公司 | DC/DC converter and pre-bias control method and device thereof |
| CN111555631B (en) * | 2020-05-22 | 2022-05-31 | 北京新雷能科技股份有限公司 | DC/DC converter and pre-bias control method and device thereof |
| CN112769323A (en) * | 2020-12-30 | 2021-05-07 | 深圳市皓文电子有限公司 | Method for realizing synchronous rectification soft start |
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| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Floor 5, Building A5, Zhiyuan, No. 1001, Xueyuan Avenue, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Haowen Electronics Co.,Ltd. Address before: Floor 5, Building A5, Zhiyuan, No. 1001, Xueyuan Avenue, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: HAWAN ELECTRONICS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |