CN104883034B - Drive circuit and Switching Power Supply for switching bridge arm - Google Patents
Drive circuit and Switching Power Supply for switching bridge arm Download PDFInfo
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- CN104883034B CN104883034B CN201510244027.XA CN201510244027A CN104883034B CN 104883034 B CN104883034 B CN 104883034B CN 201510244027 A CN201510244027 A CN 201510244027A CN 104883034 B CN104883034 B CN 104883034B
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Abstract
The embodiment of the present invention provides the drive circuit for switching bridge arm, including：Driving chip, double winding driving transformer and drive module；Driving chip is connected for producing the two ends of drive signal and the first output end and the second output end respectively with the primary side of double winding driving transformer；The two ends of the secondary of double winding driving transformer and the first input end of drive module and the second input are connected respectively；The grid that first output end of drive module is used for the upper pipe with switching bridge arm is connected, and the second output end of drive module is used to be connected with the source electrode of the upper pipe of switch bridge arm；The grid that second output end of driving chip is used for the down tube with switching bridge arm is connected；Wherein, drive module is used to cause that the voltage only higher than predetermined threshold value can just to act on the grid and source electrode for the upper pipe for switching bridge arm.The drive circuit can solve the problem that pipe floats the power pin of crystal drive circuit and the overpressure problems of ground terminal pin, and can improve the reliability of the upper pipe driving of switch bridge arm.
Description
Technical field
The present embodiments relate to the communications field, and more particularly, to a kind of drive circuit for being used to switch bridge arm
And Switching Power Supply.
Background technology
The advantages of Switching Power Supply is due to small volume, lightweight, efficiency high, using being becoming increasingly popular.Switch bridge arm extensive
It is present in Switching Power Supply, some topological scenes also have multigroup switch bridge arm.Make switch bridge arm normal work, then selection
A kind of suitable and reliable drive circuit often turns into key.
In switch bridge arm, in order to which two bridge arms simultaneously turn on (also referred to as lead directly to) above and below preventing, two bridge arms up and down
Driving is required for setting Dead Time (deadtime).In the prior art, as shown in figure 1, due to loop of power circuit leakage inductance Ls1 and
Ls2 presence, when upper pipe Q1 is turned off, Ls2 electric current can not be mutated, and be initially zero, can so cause the negative overshoot of Vsw networks,
Cause driving chip pin Vs negative pressure exceeded, this can cause driving chip occur breech lock, charging bootstrap capacitor overtension, and then
The power pin Vb of pipe in damage.Similar situation may occur at the down tube Q2 shut-off moment, causes Vsw networks just to overshoot, leads
Cause driving chip overstress damage.Therefore bridge arm driving chip into Switching Power Supply reliability short slab.
The content of the invention
The embodiment of the present invention provides a kind of drive circuit for being used to switch bridge arm, can solve the problem that pipe floats the power supply of crystal drive circuit
The overpressure problems of pin and ground terminal pin.
First aspect is used to switch the drive circuit of bridge arm there is provided a kind of, including：Driving chip (101), double winding driving
Transformer (102) and drive module (103)；
The driving chip (101) is used to produce drive signal, and the first output end of the driving chip (101) and
Second output end of the driving chip (101) respectively with the first end of the primary side of the double winding driving transformer (102) and
Second end is connected；
The first end of the secondary of the double winding driving transformer (102) and the second end and the drive module (103)
First input end and the second input of the drive module (103) are connected respectively；
First output end of the drive module (103) is used to be connected with the grid of the upper pipe of the switch bridge arm, described
Second output end of drive module (103) is used to be connected with the source electrode of the upper pipe of the switch bridge arm；The driving chip (101)
The second output end be used to be connected with the grid of down tube of the switch bridge arm；
Wherein, the drive module (103) is used to cause that the voltage only higher than predetermined threshold value can just to act on described open
Close the grid and source electrode of the upper pipe of bridge arm.
With reference in a first aspect, in the first possible implementation of first aspect, the drive module includes two
Pressure drop diode VD1 and VD2, two triode Q11 and Q12, four resistance R1, R2, R3 and R4；
The first input end connection pressure drop diode VD1 of drive module first end, the pressure drop diode VD1's
Second end connection pressure drop diode VD2 first end, the second end connection resistance R1 of pressure drop diode VD2 first end,
The second end of the resistance R1 connects the first output end of the drive module；
Triode Q11 base stage connection resistance R3 first end, the emitter stage of the triode Q11 connects the resistance R1
First end, the colelctor electrode connection resistance R4 of triode Q11 first end；
Triode Q12 base stage connects the first end of the resistance R4, and the emitter stage connection of the triode Q12 is described to drive
Second output end of dynamic model block, the colelctor electrode connection resistance R2 of the triode Q12 the second end；
The first end of the resistance R3 connects the second end of the pressure drop diode VD1, and the second end of the resistance R3 connects
Connect the second input of the drive module；
The second end of the resistance R4 connects the second input of the drive module, and the second end of the resistance R4 connects
Connect the second output end of the drive module；
The first end of the resistance R2 connects the first output end of the drive module；
Wherein, pressure drop the diode VD1 and VD2 of the voltage of the predetermined threshold value with being connected in series forward voltage drop have
Close.
With reference to the first possible implementation of first aspect or first aspect, second in first aspect may
Implementation in, the upper pipe of the driving chip floats crystal drive circuit ground terminal pin Vs and the driving chip down tube ground terminal GND
Connection.
With reference to first aspect or any possible implementation of first aspect, the third in first aspect may
Implementation in, it is described switch bridge arm upper pipe grid and the switch bridge arm upper pipe source electrode between connect resistance
R5。
There is provided a kind of Switching Power Supply, including switch bridge arm (200) and drive circuit (100) for second aspect.The switch bridge
Arm (200) includes top tube and down tube；The drive circuit (100) includes driving chip (101), double winding driving transformer
And drive module (103) (102)；
The driving chip (101) is used to produce drive signal, and the first output end of the driving chip (101) and
Second output end of the driving chip (101) respectively with the first end of the primary side of the double winding driving transformer (102) and
Second end is connected；
The first end of the secondary of the double winding driving transformer (102) and the second end and the drive module (103)
First input end and the second input of the drive module (103) are connected respectively；
First output end of the drive module (103) is connected with the grid of the upper pipe of the switch bridge arm (200), described
Second output end of drive module (103) is connected with the source electrode of the upper pipe of the switch bridge arm (200)；The driving chip
(101) the second output end is connected with the grid of the down tube of the switch bridge arm (200)；
Wherein, the drive module (103) is used to cause that the voltage only higher than predetermined threshold value can just to act on described open
Close the grid and source electrode of the upper pipe of bridge arm (200).
With reference to second aspect, in the first possible implementation of second aspect, the drive module includes two
Pressure drop diode VD1 and VD2, two triode Q11 and Q12, four resistance R1, R2, R3 and R4；
The first input end connection pressure drop diode VD1 of drive module first end, the pressure drop diode VD1's
Second end connection pressure drop diode VD2 first end, the second end connection resistance R1 of pressure drop diode VD2 first end,
The second end of the resistance R1 connects the first output end of the drive module；
Triode Q11 base stage connection resistance R3 first end, the emitter stage of the triode Q11 connects the resistance R1
First end, the colelctor electrode connection resistance R4 of triode Q11 first end；
Triode Q12 base stage connects the first end of the resistance R4, and the emitter stage connection of the triode Q12 is described to drive
Second output end of dynamic model block, the colelctor electrode connection resistance R2 of the triode Q12 the second end；
The first end of the resistance R3 connects the second end of the pressure drop diode VD1, and the second end of the resistance R3 connects
Connect the second input of the drive module；
The second end of the resistance R4 connects the second input of the drive module, and the second end of the resistance R4 connects
Connect the second output end of the drive module；
The first end of the resistance R2 connects the first output end of the drive module；
Wherein, the voltage of the predetermined threshold value and the forward voltage drop of pressure drop the diode VD1 and VD2 that is connected in series be just
It is related.
With reference to the first possible implementation of second aspect or second aspect, second in second aspect may
Implementation in, the upper pipe of the driving chip floats crystal drive circuit ground terminal pin Vs and the driving chip down tube ground terminal GND
Connection.
With reference to second aspect or any possible implementation of second aspect, the third in second aspect may
Implementation in, it is described switch bridge arm upper pipe grid and the switch bridge arm upper pipe source electrode between connect resistance
R5。
The power pin and ground terminal of the floating crystal drive circuit of pipe in the drive circuit for being used to switch bridge arm of the embodiment of the present invention, solution
The overpressure problems of pin, and the reliability of the upper pipe driving of switch bridge arm can be improved.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be in embodiment or description of the prior art
The required accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention
Example is applied, for those of ordinary skill in the art, without having to pay creative labor, can also be attached according to these
Figure obtains other accompanying drawings.
Fig. 1 is a kind of schematic diagram of drive circuit for driving switch bridge arm in the prior art.
Fig. 2 is the schematic diagram of the drive circuit for driving switch bridge arm of one embodiment of the invention.
Fig. 3 is the schematic diagram of the drive module in the drive circuit of the embodiment of the present invention.
Fig. 4 is the schematic diagram of the voltage waveform of the embodiment of the present invention.
Fig. 5 is the schematic diagram of the drive circuit for driving switch bridge arm of another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
MOSFET is because switching speed is fast, easily in parallel, the required low advantage of driving power is the most frequently used as Switching Power Supply
One of device for power switching.And the quality of drive circuit directly affects the reliability and performance indications of Switching Power Supply work.
Fig. 2 is the schematic diagram of the drive circuit for driving switch bridge arm of one embodiment of the invention.Drive shown in Fig. 2
Dynamic circuit 100 includes driving chip 101, double winding driving transformer 102 and drive module 103.
In addition, also show switch bridge arm 200 in the function in order to describe drive circuit 100, Fig. 2, it is appreciated that Fig. 2 shows
Go out for Switching Power Supply, Switching Power Supply includes drive circuit 100 and switch bridge arm 200.The switch bridge arm 200 include upper pipe Q1 and
Down tube Q2, and Q1/Q2 midpoint is Vsw.
It should be noted that the switch bridge arm 200 shown in Fig. 2 is only a schematical expression, switch bridge arm can also be it
His form, for example, it may be the switch bridge arm in the Switching Power Supply of BUCK patterns, or can be the switch of BOOST patterns
Switch bridge arm in power supply, or can also be the switch bridge arm in the Switching Power Supply of BRIDGE patterns.
Wherein, the input signal of driving chip 101 is Hi and Li, and the output signal of driving chip 101 is Ho and Lo.This hair
In bright embodiment, the output signal of driving chip 101 is referred to as the first output end for Ho output end, by driving chip 101
Output signal is referred to as the second output end for Lo output end.
In the embodiment of the present invention, driving chip 101 is used for output drive signal, and such as drive signal can be with dead band
The pulse signal of time.
Also, the upper pipe of driving chip 101 is floating to drive the down tube ground terminal GND that ground terminal Vs pins are directly connected to driving chip 101,
That is Vs pins are directly grounded, and carrying out network without the midpoint Vsw with Q1/Q2 in switch bridge arm 200 is connected, and can so eliminate drive
The voltage stress problem of the Vs pins of dynamic chip 101.
The first output end (Ho) of driving chip 101 and the second output end (Lo) of driving chip 101 respectively with double winding
The first end of the primary side of driving transformer 102 and the connection of the second end.Wherein, double winding driving transformer 102 can use magnet ring,
Former secondary is realized using Double-wire parallel wound mode.
In the embodiment of the present invention, the primary side of double winding driving transformer 102 (T1) is exported using the first of driving chip 101
The second output end (Lo) push-pull drive of (Ho) and driving chip 101 is held, can avoid managing on drive circuit 100 floating to drive and be brought
The pin Vb and Vs to driving chip 101 electrical over-stress (Electrical Over Stress, EOS) integrity problem.
Also, use double winding simultaneously compared to the double winding driving transformer 102 (T1) used in Multiple coil mode, the embodiment of the present invention
Around mode, leakage inductance can be reduced, and then the concussion of driving side can be reduced.
In the embodiment of the present invention, drive module 103 has two inputs, is referred to as the first input of drive module 103
End and the second input of drive module 103；Drive module 103 has two outputs, is referred to as the first of drive module 103
Second output end of output end and drive module 103.
The first end of the secondary of double winding driving transformer 102 (T1) and the second end and the first input of drive module 103
Second input of end and drive module 103 is connected respectively.
Wherein, drive module 103 is used to make it that the voltage only higher than predetermined threshold value can just act on the switch bridge arm
Upper pipe grid g and source electrode s.So, drive module 103 can isolate less voltage by upper pipe, so as to reduce
The influence that the concussion of driving voltage zero passage is opened to upper pipe.Specifically, the structure of the voltage of predetermined threshold value and drive module 103 and set
It is equipped with pass.
Upper pipe Q1 and down tube Q2 that drive circuit 100 in the embodiment of the present invention is used in driving switch bridge arm 200.
Specifically, the first output end of drive module 103 is used to be connected with the upper pipe Q1 of switch bridge arm 200 grid g, drives
The source electrode s that second output end of dynamic model block 103 is used for the upper pipe Q1 with switching bridge arm 200 is connected.Wherein, alternatively, mould is driven
Second output end of block 103 can be used for being connected with upper pipe Q1 and down tube Q2 midpoint Vsw.As shown in Fig. 2 drive module 103
The second output end can be connected by inductance Ls1 with switching the upper pipe Q1 source electrode s of bridge arm 200.That is, driving chip
101st, the driving of double winding driving transformer 102 and drive module 103 collectively as the upper pipe Q1 of switch bridge arm 200.
Specifically, the second output end (Lo) of driving chip 101 is used for the grid g of the down tube (Q2) with switching bridge arm 200
Connection, and the source electrode s ground connection of the down tube (Q2) of switch bridge arm 200.That is, the down tube (Q2) of switch bridge arm 200 is by driving
Driving output (Lo) direct drive of chip 101.
Further, in the embodiment of the present invention, drive module 103 can with as shown in figure 3, including：Two pressure drop diodes
VD1 and VD2, two triode Q11 and Q12, four resistance R1, R2, R3 and R4.
The first input end connection pressure drop diode VD1 of drive module first end, the pressure drop diode VD1's
Second end connection pressure drop diode VD2 first end, the second end connection resistance R1 of pressure drop diode VD2 first end,
The second end of the resistance R1 connects the first output end of the drive module；
Triode Q11 base stage connection resistance R3 first end, the emitter stage of the triode Q11 connects the resistance R1
First end, the colelctor electrode connection resistance R4 of triode Q11 first end；
Triode Q12 base stage connects the first end of the resistance R4, and the emitter stage connection of the triode Q12 is described to drive
Second output end of dynamic model block, the colelctor electrode connection resistance R2 of the triode Q12 the second end；
The first end of the resistance R3 connects the second end of the pressure drop diode VD1, and the second end of the resistance R3 connects
Connect the second input of the drive module；
The second end of the resistance R4 connects the second input of the drive module, and the second end of the resistance R4 connects
Connect the second output end of the drive module；
The first end of the resistance R2 connects the first output end of the drive module.
Wherein, the voltage of predetermined threshold value and two diodes VD1 and VD2 being connected in series forward voltage drop positive correlation.
It is understood that drive module 103 includes level translation circuit and discharge circuit.Wherein, level translation circuit includes pressure
Diode VD1 and pressure drop diode VD2 drops.Level translation circuit is realized using the forward voltage drop of VD1 and VD2 series connection.
Also, if it is desired to obtain higher translation level, the diode or voltage-stabiliser tube of the greater number that can connect.That is, this hair
Though it is shown that two pressure drop diodes of VD1 and VD2, can be including series connection when actually realizing three are even more in bright embodiment
Multiple pressure drop diodes, this is not limited by the present invention.So, the forward voltage of only double winding driving transformer 102 is more than
Pipe Q1 grid g can be just acted on during diode drop.
Wherein, discharge circuit is included such as the triode Q11 and triode Q12 in Fig. 3.So, when double winding drives transformation
When the output voltage of device 102 is reverse, upper pipe Q1 and down tube Q2 conducting, upper pipe Q1 gate charge accelerates to discharge by R2 and Q12,
Pipe Q1 is set to turn off rapidly.
It can be seen that, if the output voltage waveforms for assuming the vice-side winding of double winding driving transformer 102 (T1) are VT1, then,
Voltage higher than diode drop can act on the upper pipe Q1 for switching bridge arm grid g and source electrode s, so as to obtain VGS1 letters
Number.For the driving for the down tube Q2 for switching bridge arm, directly provided by the second output end (Lo) of driving chip 101, obtain VGS2
Signal.It may refer to as shown in Figure 4.
In addition, in the embodiment of the present invention, electricity can also be connected between the upper pipe Q1 for switching bridge arm 200 grid g and source electrode s
Hinder R5, the input impedance between grid g and source electrode s for reducing upper pipe Q1.It is illustrated in figure 5 another embodiment of the present invention
The schematic diagram of drive circuit, drive module 103 therein is the circuit shown in Fig. 3, and also includes resistance R5 in Fig. 5.
So, in the embodiment of the present invention, the driving electricity that a kind of peripheral circuit is simple, reliability is high is provided for switch bridge arm
Road, can be applied to the application scenarios of high power density modular power source.Wherein, shaken in Dead Time in the presence of some, double winding
Driving transformer minimizes leakage inductance, and leakage inductance is smaller, and concussion amplitude is lower, and further improves drive by drive circuit
Dynamic reliability.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Member and algorithm steps, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel
Described function can be realized using distinct methods to each specific application, but this realization is it is not considered that exceed
The scope of the present invention.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
, can be with several embodiments provided herein, it should be understood that disclosed systems, devices and methods
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Divide, only a kind of division of logic function there can be other dividing mode when actually realizing, such as multiple units or component
Another system can be combined or be desirably integrated into, or some features can be ignored, or do not perform.It is another, it is shown or
The coupling each other discussed or direct-coupling or communication connection can be the indirect couplings of device or unit by some interfaces
Close or communicate to connect, can be electrical, machinery or other forms.
The unit illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part shown can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units it is integrated in a unit.
If the function is realized using in the form of SFU software functional unit and is used as independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Understood based on such, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are make it that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each of the invention embodiment methods described.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (Read-Only Memory, ROM), arbitrary access are deposited
Reservoir (Random Access Memory, RAM), magnetic disc or CD etc. are various can be with the medium of store program codes.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (6)
1. a kind of drive circuit (100) for being used to switch bridge arm, it is characterised in that including：Driving chip (101), double winding drive
Dynamic transformer (102) and drive module (103)；
The driving chip (101) is used to produce drive signal, and the first output end of the driving chip (101) and described
The first end and second of second output end of driving chip (101) respectively with the primary side of the double winding driving transformer (102)
End connection, the upper pipe of the driving chip floats crystal drive circuit ground terminal pin Vs and is connected with the down tube ground terminal GND of the driving chip；
The first end of the secondary of the double winding driving transformer (102) and the second end and the first of the drive module (103)
Input and the second input of the drive module (103) are connected respectively；
First output end of the drive module (103) is used to be connected with the grid of the upper pipe of the switch bridge arm, the driving
Second output end of module (103) is used to be connected with the source electrode of the upper pipe of the switch bridge arm；The of the driving chip (101)
Two output ends are used to be connected with the grid of the down tube of the switch bridge arm；
Wherein, the drive module (103) is used to make it that the voltage only higher than predetermined threshold value can just act on the switch bridge
The grid and source electrode of the upper pipe of arm.
2. drive circuit according to claim 1, it is characterised in that the drive module includes two pressure drop diodes
VD1 and VD2, two triode Q11 and Q12, four resistance R1, R2, R3 and R4；
The first input end connection pressure drop diode VD1 of drive module first end, the second of the pressure drop diode VD1
End connection pressure drop diode VD2 first end, the second end connection resistance R1 of pressure drop diode VD2 first end is described
Resistance R1 the second end connects the first output end of the drive module；
Triode Q11 base stage connection resistance R3 first end, the emitter stage of the triode Q11 connects the of the resistance R1
One end, the colelctor electrode connection resistance R4 of triode Q11 first end；
Triode Q12 base stage connects the first end of the resistance R4, and the emitter stage of the triode Q12 connects the driving mould
Second output end of block, the colelctor electrode connection resistance R2 of the triode Q12 the second end；
The first end of the resistance R3 connects the second end of the pressure drop diode VD1, the second end connection institute of the resistance R3
State the second input of drive module；
The second end of the resistance R4 connects the second input of the drive module, and the second end connection institute of the resistance R4
State the second output end of drive module；
The first end of the resistance R2 connects the first output end of the drive module；
Wherein, the voltage of the predetermined threshold value and pressure drop the diode VD1 and VD2 that are connected in series forward voltage drop positive
Close.
3. drive circuit according to claim 1 or 2, it is characterised in that the grid of the upper pipe of the switch bridge arm and institute
Connection resistance R5 between the source electrode for the upper pipe for stating switch bridge arm.
4. a kind of Switching Power Supply, it is characterised in that including：
Bridge arm (200) is switched, the switch bridge arm (200) includes top tube and down tube；
Drive circuit (100), the drive circuit (100) include driving chip (101), double winding driving transformer (102) and
Drive module (103)；
The driving chip (101) is used to produce drive signal, and the first output end of the driving chip (101) and described
The first end and second of second output end of driving chip (101) respectively with the primary side of the double winding driving transformer (102)
End connection, the upper pipe of the driving chip floats crystal drive circuit ground terminal pin Vs and is connected with the down tube ground terminal GND of the driving chip；
The first end of the secondary of the double winding driving transformer (102) and the second end and the first of the drive module (103)
Input and the second input of the drive module (103) are connected respectively；
First output end of the drive module (103) is connected with the grid of the upper pipe of the switch bridge arm (200), the driving
Second output end of module (103) is connected with the source electrode of the upper pipe of the switch bridge arm (200)；The driving chip (101)
Second output end is connected with the grid of the down tube of the switch bridge arm (200)；
Wherein, the drive module (103) is used to make it that the voltage only higher than predetermined threshold value can just act on the switch bridge
The grid and source electrode of the upper pipe of arm (200).
5. Switching Power Supply according to claim 4, it is characterised in that the drive module includes two pressure drop diodes
VD1 and VD2, two triode Q11 and Q12, four resistance R1, R2, R3 and R4；
The first input end connection pressure drop diode VD1 of drive module first end, the second of the pressure drop diode VD1
End connection pressure drop diode VD2 first end, the second end connection resistance R1 of pressure drop diode VD2 first end is described
Resistance R1 the second end connects the first output end of the drive module；
Triode Q11 base stage connection resistance R3 first end, the emitter stage of the triode Q11 connects the of the resistance R1
One end, the colelctor electrode connection resistance R4 of triode Q11 first end；
Triode Q12 base stage connects the first end of the resistance R4, and the emitter stage of the triode Q12 connects the driving mould
Second output end of block, the colelctor electrode connection resistance R2 of the triode Q12 the second end；
The first end of the resistance R3 connects the second end of the pressure drop diode VD1, the second end connection institute of the resistance R3
State the second input of drive module；
The second end of the resistance R4 connects the second input of the drive module, and the second end connection institute of the resistance R4
State the second output end of drive module；
The first end of the resistance R2 connects the first output end of the drive module；
Wherein, the voltage of the predetermined threshold value and pressure drop the diode VD1 and VD2 that are connected in series forward voltage drop positive
Close.
6. the Switching Power Supply according to claim 4 or 5, it is characterised in that the grid of the upper pipe of the switch bridge arm and institute
Connection resistance R5 between the source electrode for the upper pipe for stating switch bridge arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510244027.XA CN104883034B (en) | 2015-05-14 | 2015-05-14 | Drive circuit and Switching Power Supply for switching bridge arm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510244027.XA CN104883034B (en) | 2015-05-14 | 2015-05-14 | Drive circuit and Switching Power Supply for switching bridge arm |
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| Publication Number | Publication Date |
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| CN104883034A CN104883034A (en) | 2015-09-02 |
| CN104883034B true CN104883034B (en) | 2017-07-14 |
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Families Citing this family (2)
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| CN111049382B (en) * | 2019-12-31 | 2021-09-14 | 广州金升阳科技有限公司 | BUCK control circuit and control method thereof |
| CN112953179A (en) * | 2021-04-09 | 2021-06-11 | 广东东菱电源科技有限公司 | Ultrahigh voltage LLC half-bridge drive circuit and working method thereof |
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| CN103347356A (en) * | 2013-07-08 | 2013-10-09 | 佛山肆强科技有限公司 | HID lamp power supplying method, circuit used by same and working method of circuit |
| CN203352423U (en) * | 2013-05-21 | 2013-12-18 | 东莞市盈聚电子有限公司 | Switching tube driving amplifying circuit for switching power supply |
| CN203554270U (en) * | 2013-10-11 | 2014-04-16 | 苏州汇川技术有限公司 | MOSFET drive circuit |
| CN104518650A (en) * | 2014-12-18 | 2015-04-15 | 杭州华为数字技术有限公司 | Driving circuit for driving switching devices, control circuit and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5618733B2 (en) * | 2009-12-09 | 2014-11-05 | ローム株式会社 | Semiconductor device and switching regulator using the same |
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2015
- 2015-05-14 CN CN201510244027.XA patent/CN104883034B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203352423U (en) * | 2013-05-21 | 2013-12-18 | 东莞市盈聚电子有限公司 | Switching tube driving amplifying circuit for switching power supply |
| CN103347356A (en) * | 2013-07-08 | 2013-10-09 | 佛山肆强科技有限公司 | HID lamp power supplying method, circuit used by same and working method of circuit |
| CN203554270U (en) * | 2013-10-11 | 2014-04-16 | 苏州汇川技术有限公司 | MOSFET drive circuit |
| CN104518650A (en) * | 2014-12-18 | 2015-04-15 | 杭州华为数字技术有限公司 | Driving circuit for driving switching devices, control circuit and device |
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| CN104883034A (en) | 2015-09-02 |
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